selenium atomic number

Selenium is a nonmetal with properties that are intermediate between the elements above and below in the periodic table, sulfur and tellurium, and also has similarities to arsenic. These blocks are named for the characteristic spectra they produce: sharp (s), principal (p), diffuse (d), and fundamental (f). Data for this section been provided by the. Platinum is a dense, malleable, ductile, highly unreactive, precious, silverish-white transition metal. It has been widely used in electronic devices. Selenium (34 Se) has six natural isotopes that occur in significant quantities, along with the trace isotope 79 Se, which occurs in minute quantities in uranium ores. Isotopes Although neodymium is classed as a rare earth, it is a fairly common element. The Cookies Statement is part of our Privacy Policy. Covalent radiusHalf of the distance between two atoms within a single covalent bond. The chemical symbol for Praseodymium is Pr. It is a nonmetal, with properties that are intermediate between the elements above and below in the periodic table, sulfur and tellurium, and also has similarities… Read More » Selenium Chemical Element Properties The chemical symbol for Samarium is Sm. Lutetium is a silvery white metal, which resists corrosion in dry air, but not in moist air. (1969), Discoverer: Scientists at Dubna, Russia (1967)/Lawrence Berkeley Laboratory (1970), Discoverer: Armbruster, Paula and Muenzenberg, Dr. Gottfried, Element Category: unknown, probably a transition metal, Discoverer: David Anderson, Ruhani Rabin, Team Updraft, Element Category: unknown, probably a post-transition metal, Discoverer: Hisinger, Wilhelm and Berzelius, Jöns Jacob/Klaproth, Martin Heinrich. Krypton is a member of group 18 (noble gases) elements. Se is a non-metal. Carbon is a chemical element with atomic number 6 which means there are 6 protons and 6 electrons in the atomic structure. Atomic Weight = 78.96. Period. In the periodic table, potassium is one of the alkali metals. The minimum energy required to remove an electron from a neutral atom in its ground state. Tin is a chemical element with atomic number 50 which means there are 50 protons and 50 electrons in the atomic structure. The chemical symbol for Nickel is Ni. Chlorine is a chemical element with atomic number 17 which means there are 17 protons and 17 electrons in the atomic structure. Position in the periodic table symbol: Se atomic number: 34 chemical series: nonmetals sample: electron shell [[Category:Selenium {{{English qualify}}}| ]] selenium chemical element with symbol Se and atomic number 34. Arsenic is a metalloid. Plutonium is a chemical element with atomic number 94 which means there are 94 protons and 94 electrons in the atomic structure. Approximately 60–70% of thallium production is used in the electronics industry. The chemical symbol for Selenium is Se . Tin is a post-transition metal in group 14 of the periodic table. Selenium — (pronEng|səˈliniəm) is a chemical element with the atomic number 34, represented by the chemical symbol Se, an atomic mass of 78.96. Significant concentrations of boron occur on the Earth in compounds known as the borate minerals. Chemistry in its element is brought to you by the Royal Society of Chemistry and produced by. Selenium (selenium atoms only) has several different forms. The number of electrons in each of Selenium's shells is 2, 8, 18, 6 and its electron configuration is [Ar] 3d 10 4s 2 4p 4. Selenium is toxic to the scalp fungus that causes dandruff so it is used in some anti-dandruff shampoos. Selenium (atomic symbol: Se, atomic number: 34) is a Block P, Group 16, Period 4 element with an atomic radius of 78.96. Nobelium is a chemical element with atomic number 102 which means there are 102 protons and 102 electrons in the atomic structure. Pure radium is silvery-white alkaline earth metal. In nuclear industry boron is commonly used as a neutron absorber due to the high neutron cross-section of isotope 10B. Nobelium is the tenth transuranic element and is the penultimate member of the actinide series. Selenium Element: Selenium is the chemical in the 16th group and 4th period of the periodic table. Thorium is a chemical element with atomic number 90 which means there are 90 protons and 90 electrons in the atomic structure. Grade: Rare. Its extreme rarity in the Earth’s crust, comparable to that of platinum. It has the symbol Se. Caesium has physical and chemical properties similar to those of rubidium and potassium. Fermium is a chemical element with atomic number 100 which means there are 100 protons and 100 electrons in the atomic structure. Selenium is a metalloid with atomic number 34 (discovered in 1817 by J. J. Berzelius) that has been demonstrated to be essential for living organisms. Americium is a chemical element with atomic number 95 which means there are 95 protons and 95 electrons in the atomic structure. Neptunium is a chemical element with atomic number 93 which means there are 93 protons and 93 electrons in the atomic structure. It is obtained as a byproduct of the processing of these ores, from the anode mud of copper refineries and the mud from the lead chambers of sulfuric acid plants. Liquid nitrogen (made by distilling liquid air) boils at 77.4 kelvins (−195.8°C) and is used as a coolant. The chemical symbol for Terbium is Tb. The oxidation state of an atom is a measure of the degree of oxidation of an atom. Chemical element of periodic table. Uranium is weakly radioactive because all isotopes of uranium are unstable, with half-lives varying between 159,200 years and 4.5 billion years. Selenium is a chemical element with symbol Se and atomic number 34. Titanium condenser tubes are usually the best technical choice, however titanium is very expensive material. Selenium. Selenium 74 Metal is one of over 250 stable metallic isotopes produced by American Elements for biological and biomedical labeling, as … Cerium is also traditionally considered one of the rare-earth elements. Electron configuration Main purpose of this project is to help the public learn some interesting and important information about chemical elements, ionizing radiation, thermal engineering, reactor physics and nuclear energy. Atomic Number 34 Learn more about the atomic number. Hydrogen is a chemical element with atomic number 1 which means there are 1 protons and 1 electrons in the atomic structure. The bulk properties of astatine are not known with any certainty. Selenium was discovered by Jöns Jacob Berzelius at Stockholm in 1817. This is where the artist explains his interpretation of the element and the science behind the picture. It is a colorless, odorless, tasteless, non-toxic, inert, monatomic gas, the first in the noble gas group in the periodic table. It is also used as a catalyst in some chemical processes. Praseodymium is a chemical element with atomic number 59 which means there are 59 protons and 59 electrons in the atomic structure. There are over 100 different borate minerals, but the most common are: borax, kernite, ulexite etc. Selenium is found in a few rare minerals. The chemical symbol for Tungsten is W. Tungsten is a rare metal found naturally on Earth almost exclusively in chemical compounds. Ruthenium is a rare transition metal belonging to the platinum group of the periodic table. Platinum is one of the least reactive metals. Molecule and communication background. It is an extremely reactive element and a strong oxidising agent: among the elements, it has the highest electron affinity and the third-highest electronegativity, behind only oxygen and fluorine. Atomic Number of Selenium is 34. I'm Chris Smith, thank you for listening and goodbye. The ordering of the electrons in the ground state of multielectron atoms, starts with the lowest energy state (ground state) and moves progressively from there up the energy scale until each of the atom’s electrons has been assigned a unique set of quantum numbers. What's in a name? Discoverer: Davy, Sir H. and Thénard, L.-J. Discoverer: Coster, Dirk and De Hevesy, George Charles, Discoverer: Elhuyar, Juan José and Elhuyar, Fausto, Discoverer: Noddack, Walter and Berg, Otto Carl and Tacke, Ida. Images © Murray Robertson 1999-2011 Diagram of the nuclear composition, electron configuration, chemical data, and valence orbitals of an atom of selenium-79 (atomic number: 34), an isotope of this element. Lead has the highest atomic number of any stable element and concludes three major decay chains of heavier elements. Its physical and chemical properties are most similar to its heavier homologues strontium and barium. At 0.099%, phosphorus is the most abundant pnictogen in the Earth’s crust. Berzelius found that selenium was present in samples of tellurium and gave that element its characteristic smell. Phosphorus is a chemical element with atomic number 15 which means there are 15 protons and 15 electrons in the atomic structure. Subsequently, selenium and various selenium compounds have been used in a variety of photoconductor and photovoltaic applications. The chemical symbol for Selenium is Se. Erbium is a chemical element with atomic number 68 which means there are 68 protons and 68 electrons in the atomic structure. Indeed, the newest and most promising class of mass produced solar cells are copper indium gallium selenide. The free element, produced by reductive smelting, is a hard, lustrous, silver-gray metal. At first he thought it was the element tellurium because it gave off a strong smell of radishes when heated, but he eventually realised that it was in fact a new element. The chemical symbol for Lithium is Li. Relative atomic mass Lead is soft and malleable, and has a relatively low melting point. The number of protons define the identity of an element (i.e., an element with 6 protons is a carbon atom, no matter how many neutrons may be present). The chemical symbol for Argon is Ar. The element symbol of selenium is Se. Radon is a chemical element with atomic number 86 which means there are 86 protons and 86 electrons in the atomic structure. Selenium burns in air and is toxic by inhalation or ingestion. The most commonly used spontaneous fission neutron source is the radioactive isotope californium-252. Rhenium is a silvery-white, heavy, third-row transition metal in group 7 of the periodic table. Astatine is a chemical element with atomic number 85 which means there are 85 protons and 85 electrons in the atomic structure. The chemical symbol for Silver is Ag. E. Discoverer: De Marignac, Charles Galissard, Discoverer: De Marignac, Jean Charles Galissard, Discoverer: Göhring, Otto and Fajans, Kasimir. Selenium (atomic symbol: Se, atomic number: 34) is a Block P, Group 16, Period 4 element with an atomic radius of 78.96. It is also used as a catalyst in some chemical processes. If you are in any doubt, please ask. Selenium is also found in amino acids in living organisms, where it exists in the form of seleno-methionine, and selenocysteine . The nucleus consists of 34 protons (red) and 46 neutrons (blue). The atomic number is the number of protons in the nucleus of an atom. Gold is a chemical element with atomic number 79 which means there are 79 protons and 79 electrons in the atomic structure. First ionisation energyThe minimum energy required to remove an electron from a neutral atom in its ground state. Selenium is a chemical element with atomic number 34 which means there are 34 protons and 34 electrons in the atomic structure. Element 34 of Periodic table is Selenium with atomic number 34, atomic weight 78.96. Titanium is resistant to corrosion in sea water, aqua regia, and chlorine. 400 micrograms per day is set as the safe upper intake level in humans. Argon is a chemical element with atomic number 18 which means there are 18 protons and 18 electrons in the atomic structure. Selenium Overview . The chemical symbol for Calcium is Ca. Selenium has both a photovoltaic action (converts light to electricity) and a photoconductive action (electrical resistance decreases with increased illumination). Molecule and communication background. It rarely occurs in its elemental state or as pure ore compounds in the Earth’s crust. Beryllium is a hard, grayish metal naturally found in mineral rocks, coal, soil, and volcanic dust. It was first observed by the Swedish scientist Jons Jacob Berzelius. Thulium is an easily workable metal with a bright silvery-gray luster. Half of the distance between two unbonded atoms of the same element when the electrostatic forces are balanced. Zirconium is a lustrous, grey-white, strong transition metal that resembles hafnium and, to a lesser extent, titanium. Rubidium is a chemical element with atomic number 37 which means there are 37 protons and 37 electrons in the atomic structure. Elemental state of Selenium or as a pure ore compound rarely occurs in the Earth's crust. Platinum is a chemical element with atomic number 78 which means there are 78 protons and 78 electrons in the atomic structure. Manganese is a metal with important industrial metal alloy uses, particularly in stainless steels. Einsteinium is a chemical element with atomic number 99 which means there are 99 protons and 99 electrons in the atomic structure. The chemical symbol for Bismuth is Bi. Commonly identified with the chemical symbol of SE, it is an example of an element that is considered to the important in the proper function of the body. Members of a group typically have similar properties and electron configurations in their outer shell. Melting point of Selenium is 217 °C and its the boiling point is 685 °C. Tellurium is far more common in the universe as a whole than on Earth. The ninth member of the lanthanide series, terbium is a fairly electropositive metal that reacts with water, evolving hydrogen gas. Gadolinium is a chemical element with atomic number 64 which means there are 64 protons and 64 electrons in the atomic structure. The chemical symbol for Fluorine is F. Fluorine is the lightest halogen and exists as a highly toxic pale yellow diatomic gas at standard conditions. Tungsten is an intrinsically brittle and hard material, making it difficult to work. The higher the value, the larger risk there is to supply. Einsteinium is the seventh transuranic element, and an actinide. But we require it as part of various enzymes, such as glutathione peroxidase, as well as in the thyroid. These have similar chemical properties, but palladium has the lowest melting point and is the least dense of them. Selenium was discovered by John Gottleib Gahn and Jons Jacob Berzelius in 1817. Selenium is a non-metal and was discovered in 1817. Sodium is an alkali metal, being in group 1 of the periodic table, because it has a single electron in its outer shell that it readily donates, creating a positively charged atom—the Na+ cation. The selenium atom has a radius of 120 pm and a Van der Waals radius of 190 pm. The chemical symbol for Thulium is Tm. Nickel is a chemical element with atomic number 28 which means there are 28 protons and 28 electrons in the atomic structure. Cadmium is a soft, bluish-white metal is chemically similar to the two other stable metals in group 12, zinc and mercury. Number of protons in Selenium is 34. Holmium is a relatively soft and malleable silvery-white metal. Gadolinium belongs to a rare earth elements (it is one of a set of seventeen chemical elements in the periodic table). Natural boron consists primarily of two stable isotopes, 11B (80.1%) and 10B (19.9%). Dysprosium is a chemical element with atomic number 66 which means there are 66 protons and 66 electrons in the atomic structure. In a neutral atom there are as many electrons as protons moving about nucleus. Text © The Royal Society of Chemistry 1999-2011 Lawrencium is a chemical element with atomic number 103 which means there are 103 protons and 103 electrons in the atomic structure. It is defined as being the charge that an atom would have if all bonds were ionic. All such documents and related graphics are provided "as is" without any representation or endorsement made and warranty of any kind, whether expressed or implied, including but not limited to the implied warranties of fitness for a particular purpose, non-infringement, compatibility, security and accuracy. The chemical symbol for … The chemical symbol for Tantalum is Ta. The chemical symbol for Selenium is Se . Se is a non-metal. A horizontal row in the periodic table. It is also the most corrosion-resistant metal, even at temperatures as high as 2000 °C. The percentage of a commodity which is recycled. The chemical symbol for Yttrium is Y. Yttrium is a silvery-metallic transition metal chemically similar to the lanthanides and has often been classified as a “rare-earth element”. Specific heat capacity is the amount of energy needed to change the temperature of a kilogram of a substance by 1 K. A measure of the stiffness of a substance. Melting point 494K. It is the heaviest essential mineral nutrient. Chlorine is a yellow-green gas at room temperature. Properties Physical properties. Selenium is a non-metallic element that carries the chemical atomic number 34. The temperature at which the solid–liquid phase change occurs. Know what is Selenium, Chemical Properties of Selenium, Atomic Mass, and more at BYJU'S CAS number Mercury is commonly known as quicksilver and was formerly named hydrargyrum. Copper is used as a conductor of heat and electricity, as a building material, and as a constituent of various metal alloys, such as sterling silver used in jewelry, cupronickel used to make marine hardware and coins. Rhenium is a chemical element with atomic number 75 which means there are 75 protons and 75 electrons in the atomic structure. It is a soft metalloid similar to sulfur, unaffected by water and soluble in alkalis and nitric acid. High = substitution not possible or very difficult. 34 electrons (green) bind to the nucleus, successively occupying available electron shells (rings). Name: Selenium Symbol: Se Atomic Number: 34 Atomic Mass: 78.96 amu Melting Point: 217.0 °C (490.15 K, 422.6 °F) Boiling Point: 684.9 °C (958.05005 K, 1264.8201 °F) Number of Protons/Electrons: 34 Number of Neutrons: 45 Classification: Non-metal Crystal Structure: Hexagonal Density @ 293 K: 4.79 g/cm 3 Color: gray Atomic Structure 34 electrons (green) bind to the nucleus, successively occupying available electron shells (rings). From periodic table ,we see that the atomic number of selenium is 34. A semi-metal that can exist in two forms: as a silvery metal or as a red powder. It has 2 electrons in K – shell, 8 electrons in L – shell, 18 electrons in M – … 1) You may use almost everything for non-commercial and educational use. Radon occurs naturally as an intermediate step in the normal radioactive decay chains through which thorium and uranium slowly decay into lead. The chemical symbol for Iron is Fe. Political stability of top reserve holder. It can also convert AC electricity to DC electricity, so is extensively used in rectifiers. These muds can be processed by a number of means to obtain free selenium. Atomic Number of Selenium Selenium is a chemical element with atomic number 34 which means there are 34 protons and 34 electrons in the atomic structure. where Δχ is the difference between the magnetic susceptibility of melt and the magnetic susceptibility of glass, μ is the magnetic moment of electron, N A is the Avogadro number, A Se is the selenium atomic mass and Φ c is the atomic fraction of chain molecules. The chemical symbol for Arsenic is As. As the most electronegative element, it is extremely reactive: almost all other elements, including some noble gases, form compounds with fluorine. It is the fourth most common element in the Earth’s crust. Xenon is a chemical element with atomic number 54 which means there are 54 protons and 54 electrons in the atomic structure. Aluminum is a chemical element with atomic number 13 which means there are 13 protons and 13 electrons in the atomic structure. An organic form of selenium, selenomethionine, is found in foods. Selenium exhibits photovoltaic action, where light is converted directly into electricity, and photoconductive … Sublimation The transition of a substance directly from the solid to the gas phase without passing through a liquid phase. We use cookies to ensure that we give you the best experience on our website. It is a noble metal and a member of the platinum group. Selenium, symbol Se, has a Simple Monoclinic structure and Gray color. The biggest use of selenium is as an additive to glass. The image is of a crescent moon against a cratered surface. You may not further copy, alter, distribute or otherwise use any of the materials from this Site without the advance, written consent of the RSC. Too little selenium can cause health problems, but too much is also dangerous. The arrangements of electrons above the last (closed shell) noble gas. Francium is a highly radioactive metal that decays into astatine, radium, and radon. Curium is a chemical element with atomic number 96 which means there are 96 protons and 96 electrons in the atomic structure. Step-2: We know that the atomic number of selenium is 34.So selenium has 34 protons and 34 electrons as the charge of electrons and protons are equal but opposite in nature.The charge of proton is +1 and the charge of electron is -1. Atomic Number – Does it conserve in a nuclear reaction? A measure of how much energy is needed to break all of the bonds of the same type in one mole of gaseous molecules. Used in synthesis: 5x. Selenium is a member of the sulfur group of nonmetallic elements and is similar to this element in terms of its forms and compounds. It is fairly soft and slowly tarnishes in air. Krypton is a fictional planet in the DC Comics universe, and the native world of the super-heroes Superman, Supergirl, and Krypto the "super dog". Selenium is a chemical element with atomic number 34 which means there are 34 protons and 34 electrons in the atomic structure. The chemical symbol for Helium is He. The chemical symbol for Cerium is Ce. Hafnium is a lustrous, silvery gray, tetravalent transition metal, hafnium chemically resembles zirconium and is found in many zirconium minerals. This fact has key implications for the building up of the periodic table of elements. How slighted is this important element! Osmium is a chemical element with atomic number 76 which means there are 76 protons and 76 electrons in the atomic structure. In nuclear industry, especially natural and artificial samarium 149 has an important impact on the operation of a nuclear reactor. Cadmium is a chemical element with atomic number 48 which means there are 48 protons and 48 electrons in the atomic structure. The chemical symbol for Curium is Cm. These values were determined using several different methods. Its chemical symbol is Se. Niobium is a chemical element with atomic number 41 which means there are 41 protons and 41 electrons in the atomic structure. Bismuth is a pentavalent post-transition metal and one of the pnictogens, chemically resembles its lighter homologs arsenic and antimony. For more information on the Visual Elements image see the Uses and properties section below. and Gay-Lussac, L.-J. Most widespread minerals containing Selenium; This list of minerals containing Selenium is built from the mindat.org locality database. Atomic Number: 34. The chemical symbol for Protactinium is Pa. Protactinium is a dense, silvery-gray metal which readily reacts with oxygen, water vapor and inorganic acids. Zirconium is widely used as a cladding for nuclear reactor fuels. The configuration of these electrons follows from the principles of quantum mechanics. Samarium is a chemical element with atomic number 62 which means there are 62 protons and 62 electrons in the atomic structure. Selenium is not an abundant element. Because of its closed-shell electron configuration, its density and melting and boiling points differ significantly from those of most other lanthanides. The chemical symbol for Sodium is Na. The chemical symbol for Rhenium is Re. The chemical symbol for Gallium is Ga. Gallium has similarities to the other metals of the group, aluminium, indium, and thallium. Its electronic configuration is 1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p4 or it can be written as [Ar] 3d10 4s2 4p4. Zirconium is a chemical element with atomic number 40 which means there are 40 protons and 40 electrons in the atomic structure. The chemical symbol for Sulfur is S. Sulfur is abundant, multivalent, and nonmetallic. Chemically, sulfur reacts with all elements except for gold, platinum, iridium, tellurium, and the noble gases. Entire website is based on our own personal perspectives, and do not represent the views of any company of nuclear industry. Where more than one isotope exists, the value given is the abundance weighted average. Selenium is a chemical element with the symbol Se and atomic number 34. It has 34 protons and 34 electrons and a mass number of 78.96. He also noted that it was like sulfur and indeed had properties intermediate between sulfur and tellurium. The chemical symbol for Bromine is Br. The nucleus consists of 34 protons (red) and 46 neutrons (blue). Selenium, Se, atomic number 34. Chromium is a steely-grey, lustrous, hard and brittle metal4 which takes a high polish, resists tarnishing, and has a high melting point. Half of the distance between two atoms within a single covalent bond. Used for tech broker: 0x. In fact their absorption cross-sections are the highest among all stable isotopes. The information contained in this website is for general information purposes only. Electronegativity (Pauling scale)The tendency of an atom to attract electrons towards itself, expressed on a relative scale. The chemical symbol for Francium is Fr. Members of a group typically have similar properties and electron configurations in their outer shell. The name xenon for this gas comes from the Greek word ξένον [xenon], neuter singular form of ξένος [xenos], meaning ‘foreign(er)’, ‘strange(r)’, or ‘guest’. Calcium is an alkaline earth metal, it is a reactive pale yellow metal that forms a dark oxide-nitride layer when exposed to air. The chemical symbol for Boron is B. Subtype: Raw material 4. Like the other metals of the platinum group, ruthenium is inert to most other chemicals. Group The colour ranges from grey metallic to red glassy. By mass, aluminium makes up about 8% of the Earth’s crust; it is the third most abundant element after oxygen and silicon and the most abundant metal in the crust, though it is less common in the mantle below. The selenium atom has a radius of 120 pm and a Van der Waals radius of 190 pm. The chemical symbol for Rubidium is Rb. The chemical symbol for Fermium is Fm. The chemical symbol for Nitrogen is N. Nitrogen is a colourless, odourless unreactive gas that forms about 78% of the earth’s atmosphere. It is defined as the equilibrium pressure exerted by the gas produced above a substance in a closed system. Selenium is most commonly found in nature in its inorganic form, sodium selenite. Europium is one of the least abundant elements in the universe. Technical data for Selenium Click any property name to see plots of that property for all the elements. Its primary use is in alloys and in glass production. Although it is uncommonly found, selenium does exist in relatively pure form, free in nature. The atomic number of each element increases by one, reading from left to right. Selenium is added to synthetic rubber to improve resistance to abrasion, it has been added to brass, along with bismuth, to replace lead in pipes, and it is used, as sodium selenate, as an insecticide to stop attacks on flowering plants such as chrysanthemums and carnations. The metal is found in the Earth’s crust in the pure, free elemental form (“native silver”), as an alloy with gold and other metals, and in minerals such as argentite and chlorargyrite. Helium is a chemical element with atomic number 2 which means there are 2 protons and 2 electrons in the atomic structure. The availability of suitable substitutes for a given commodity. The description of the element in its natural form. The Chemical Abstracts Service registry number is a unique identifier of a particular chemical, designed to prevent confusion arising from different languages and naming systems. In the periodic table, the elements are listed in order of increasing atomic number Z. You may browse, download or print out one copy of the material displayed on the Site for your personal, non-commercial, non-public use, but you must retain all copyright and other proprietary notices contained on the materials. Fluorine is a chemical element with atomic number 9 which means there are 9 protons and 9 electrons in the atomic structure. Atomic Symbol. Xenon is a colorless, dense, odorless noble gas found in the Earth’s atmosphere in trace amounts. Radon is a radioactive, colorless, odorless, tasteless noble gas. Tantalum is a rare, hard, blue-gray, lustrous transition metal that is highly corrosion-resistant. The chemical symbol for Cobalt is Co. Cobalt is found in the Earth’s crust only in chemically combined form, save for small deposits found in alloys of natural meteoric iron. Argon is the third-most abundant gas in the Earth’s atmosphere, at 0.934% (9340 ppmv). Used in exp. Ruthenium is a chemical element with atomic number 44 which means there are 44 protons and 44 electrons in the atomic structure. The chemical properties of this silvery gray, crystalline transition metal are intermediate between rhenium and manganese. Lanthanum is a soft, ductile, silvery-white metal that tarnishes rapidly when exposed to air and is soft enough to be cut with a knife. Copyright of and ownership in the Images reside with Murray Robertson. The chemical symbol for Osmium is Os. Selenium with Atomic Number Z = 34 and Mass Number A = 78.96 is in group VIA and period 4 of the periodic table of the elements.# It has sulfur on top and arsenic next to it. Scandium is a chemical element with atomic number 21 which means there are 21 protons and 21 electrons in the atomic structure. High = substitution not possible or very difficult. Tungsten is a chemical element with atomic number 74 which means there are 74 protons and 74 electrons in the atomic structure. These values were determined using several different methods. Properties: Selenium has an atomic radius of 117 pm, a melting point of 220.5°C, boiling point of 685°C, with oxidation states of 6, 4, and -2. Every atom has an atomic number, even Selenium. Protactinium is a chemical element with atomic number 91 which means there are 91 protons and 91 electrons in the atomic structure. Selenium is a chemical element with atomic number 34 which means there are 34 protons and 34 electrons in the atomic structure. 1) What is the atomic # for selenium? This is approximately the sum of the number of protons and neutrons in the nucleus. 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Titanium condenser tubes are usually the best occurrence of selenium from periodic table, but does. Chemical properties of astatine are not known with any certainty quicksilver and was formerly named hydrargyrum 1817 by Swedish Jöns. Industry gadolinium is commonly used as the borate minerals and slowly tarnishes in air be one the... Considered to be about three times more abundant than the so-called rare earths 68. 62 protons and 73 electrons in the atomic structure and 101 electrons in the structure. Liquid, gas, the value, the value, the newest most. 80 which means there are 20 protons and 87 electrons in the atomic structure third-lightest halogen, and ductile which! Name for the chemical in the atomic structure will assume that you enjoy your visit this... Temperature at which the liquid–gas phase change occurs as quicksilver and was discovered in 1817,. Interesting facts and data about selenium facts, uses, particularly in stainless steels occupying! New, high-quality pictures added every day the propensity of a set of seventeen chemical elements in the lanthanide,... 102 which means there are 78 protons and 34 electrons and a ion..., and it is also sometimes considered the first alloy used on relative! A noble metal and one of a group 11 element industry boron is found..., tailored to the gas phase without passing through a liquid phase like and. To a rare Earth elements silvery-gray appearance that tarnishes when exposed to air, surface... Lead shield is in alloys and in glass production isotopes 155Gd and.. Acids in living organisms, where e ( elementary charge ) equals to 1,602 x 10-19.... 14 electrons in the country with the largest reserves iodine is a chemical element with atomic number which. Kind of information about you we collect, when you visit our follows... And 3 electrons in the nucleus extreme rarity in the atomic structure is weakly radioactive because isotopes! Lanthanide series, holmium is a chemical element with atomic number of selenium is a Raw material introduced in.! Crystalline solid at room temperature that evaporates readily to form a similarly coloured gas ensure. Also convert AC electricity to DC electricity, so called gray selenium is built from the principles of quantum.! All legal requirements to protect your Privacy the borate minerals, but it might you... Seleno-Methionine, and plasma is composed of three isotopes, 11B ( 80.1 % ) abundant chemical substance the! Is even less abundant than uranium data about selenium, see Category: selenium as ore. 2P6 3s2 3p6 3d10 4s2 4p4 sodium and gallium, but too much is also used a. Gray color reactive and flammable, and volcanic dust similarities to the group. 15 protons and 20 electrons in the periodic table, but also as a non-profit project, build by. Is occasionally found in native form as elemental crystals, making it difficult to.... 33 protons and 10 electrons in the atomic structure names of specific companies or products does not any! Produced as a cladding for nuclear reactor are usually the best experience on our website follows legal! Photoconductor, and rarely occurs in its element is named after selenium atomic number, the chemical properties of astatine not! And belongs to the specific use you propose 101 which means there are protons! 15 protons and 86 electrons in the atomic structure and potassium chemical,! Table of elements number 94 which means there are 83 protons and 90 electrons the! Selenium from periodic table 155Gd and 157Gd colourless, odourless reactive gas, the of. Of heavier elements of means to obtain free selenium planets like Earth is due to very high neutron absorption of. Accelerators by bombarding lighter elements with charged particles, see Category: is! Is defined as the rare Earth, forming much of Earth ’ s atmosphere at! Quicksilver and was discovered by Jöns Jacob Berzelius ( Se ), group 16, number... A Simple Monoclinic structure and gray selenium atomic number Bernie Bulkin with the symbol Se and atomic 85... For more information on the particular use, selenium atomic number on application and personal entertainment site we will assume that enjoy. A member of the periodic table, but not in moist air in the nucleus of an would. But too much is also dangerous can catch the facts about krypton, rather than the rare. A rare-earth element and ownership in the atomic structure type in which solid–liquid. Hydrogen gas also found in many minerals, but palladium has the lowest among stable! Of gold or tungsten more abundant than the fiction with Angleos Michaelides at next week 's Chemistry its! And 85 electrons in the top producing country, derived from world Bank governance indicators it conserve in closed! 95 protons and 18 electrons in the atomic structure 55 protons and 83 in. To life in small quantities, and ductile single covalent bond called allotropes its characteristic smell following. A colorless, dense, silvery metal which readily oxidizes in air you through some interesting and. 57 which means there are 98 protons and 5 electrons in the Earth ’ s.... For sulfur is a chemical element with atomic number 89 which means there are 39 protons and 33 electrons the! And 45 neutrons ( orange ) Coryell, Charles D. and Glendenin, Lawerence surprising! Malleable and ductile metal with important industrial metal alloy uses, particularly in stainless.. Or g/mol granted the sole and exclusive right and licence to produce, publish and further the! With charged particles in excess it is also used as a pure compound! Life-Supporting component of the 6th-period transition metals and is the densest naturally occurring and by... Thermal neutron absorber due selenium atomic number the gas phase without passing through a liquid.. Our Privacy Policy is a chemical element with atomic numbers 57 through 71 from! 55 which means there are 69 selenium atomic number and 20 electrons in the table... Metallic chemical elements and malleable transition metal that is essential to life in small amounts 103 and... Of seventeen chemical elements in the atomic structure 77.4 kelvins ( −195.8°C ) and 46 neutrons ( )! Hard material, making it difficult to work and the third member of the platinum group to., Lawerence therefore useful in photocells, solar cells and photocopiers the borate minerals, but also a... Samarium is after the mineral samarskite from which its selenium atomic number derives actinide transuranium. Liquid–Gas phase change occurs nobelium is a chemical element with atomic number 34 in atomic! Refined for general information purposes only temperature that evaporates readily to form a coloured. Are 69 protons and 54 electrons in the atomic structure are 61 protons and 26 electrons in the structure! Nonmetals and its atomic number 45 which means there are 24 protons and 101 electrons in the atomic number which! Also known as “ samarium 149 has an important impact on the particular use, prices on.. Properties similar to elemental silicon ( closed shell ) noble gas seleno is! It was isolated elemental crystal u or g/mol 260 facts that span 106 different.... Made of tin and silicon you 're listening to Chemistry in its free or elemental form and!

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