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. Its properties are thus intermediate between those of chlorine and iodine. Bismuth is a pentavalent post-transition metal and one of the pnictogens, chemically resembles its lighter homologs arsenic and antimony. Download this stock image: Selenium chemical element. The chemical symbol for Protactinium is Pa. Protactinium is a dense, silvery-gray metal which readily reacts with oxygen, water vapor and inorganic acids. Promethium is one of only two such elements that are followed in the periodic table by elements with stable forms. 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. When I was in my early 20s I developed a dry scalp condition for a few years, probably a result of anxiety over research grants I was trying to obtain. Five of these isotopes are stable: 74 Se, 76 Se, 77 Se, 78 Se, and 80 Se. I'm Chris Smith, thank you for listening and goodbye. Rubidium is a soft, silvery-white metallic element of the alkali metal group, with an atomic mass of 85.4678. Properties of Selenium-74 Isotope: SELENIUM-74; Natural Abundance (%) 0.86: Atomic Mass (Da) 73.9224764: Relative Isotopic Mass: 73.9224764: Neutron Number (N) The chemical symbol for Tungsten is W. Tungsten is a rare metal found naturally on Earth almost exclusively in chemical compounds. 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’. Chemical element of periodic table. The chemical symbol for Samarium is Sm. The colour ranges from grey metallic to red glassy. Lead has the highest atomic number of any stable element and concludes three major decay chains of heavier elements. Some elements exist in several different structural forms, called allotropes. Conne - 2AP4NTD from Alamy's library of millions of high resolution stock photos, illustrations and vectors. 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. Se is a non-metal. Iron is a chemical element with atomic number 26 which means there are 26 protons and 26 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. It is the heaviest essential mineral nutrient. Lead is a heavy metal that is denser than most common materials. The chemical symbol for Carbon is C. It is nonmetallic and tetravalent—making four electrons available to form covalent chemical bonds. Selenium in its allotropic red form is added to glass to give it a scarlet color, but it also can be used to remove the greenish tint sometimes found in glass due to iron compounds. Argon is a chemical element with atomic number 18 which means there are 18 protons and 18 electrons in the atomic structure. Medium = substitution is possible but there may be an economic and/or performance impact, Low = substitution is possible with little or no economic and/or performance impact, If you wish to use the Images in a manner not permitted by these terms and conditions please contact the Publishing Services Department. Rhenium is a silvery-white, heavy, third-row transition metal in group 7 of the periodic table. Used in synthesis: 5x. The chemical symbol for Silicon is Si. The temperature at which the solid–liquid phase change occurs. 6 what is the number of core electrons? The chemical symbol for Calcium is Ca. The temperature at which the liquid–gas phase change occurs. Cerium is also traditionally considered one of the rare-earth elements. Radon is a chemical element with atomic number 86 which means there are 86 protons and 86 electrons in the atomic structure. It is a lanthanide, a rare earth element, originally found in the gadolinite mine in Ytterby in Sweden. Selenium chemical element. The chemical symbol for Dysprosium is Dy. Selenium is an essential trace element for some species, including humans. The energy released when an electron is added to the neutral atom and a negative ion is formed. Used in blueprints: 16x. Half of the distance between two atoms within a single covalent bond. Sign with atomic number and atomic weight. Click here to view videos about  Selenium, It’s Elemental - The Periodic Table of Elements. Very soft and malleable, indium has a melting point higher than sodium and gallium, but lower than lithium and tin. If you continue to use this site we will assume that you are happy with it. The chemical symbol for Magnesium is Mg. Magnesium is a shiny gray solid which bears a close physical resemblance to the other five elements in the second column (group 2, or alkaline earth metals) of the periodic table: all group 2 elements have the same electron configuration in the outer electron shell and a similar crystal structure. Glossary. The ninth member of the lanthanide series, terbium is a fairly electropositive metal that reacts with water, evolving hydrogen gas. Commercially, thallium is produced as a byproduct from refining of heavy metal sulfide ores. Selenium (atomic symbol: Se, atomic number: 34) is a Block P, Group 16, Period 4 element with an atomic radius of 78.96. This is calculated by combining the scores for crustal abundance, reserve distribution, production concentration, substitutability, recycling rate and political stability scores. Atomic number of selenium is 34. Selenium is not an abundant element. Where more than one isotope exists, the value given is the abundance weighted average. Group. 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. Selenium is one of those all too common elements that is essential to life in small quantities, and very toxic in larger quantities. Isotopes Thorium is moderately hard, malleable, and has a high melting point. Rhodium is a rare, silvery-white, hard, corrosion resistant and chemically inert transition metal. In fact a little investigation showed me that it was perfectly safe in small amounts. The chemical symbol for Technetium is Tc. The number of electrons in each element’s electron shells, particularly the outermost valence shell, is the primary factor in determining its chemical bonding behavior. Naturally occurring potassium is composed of three isotopes, of which 40K is radioactive. Cerium is the second element in the lanthanide series. 400 micrograms per day is set as the safe upper intake level in humans. Iridium is a chemical element with atomic number 77 which means there are 77 protons and 77 electrons in the atomic structure. Lead is a chemical element with atomic number 82 which means there are 82 protons and 82 electrons in the atomic structure. Gadolinium is a chemical element with atomic number 64 which means there are 64 protons and 64 electrons in the atomic structure. Political stability of top reserve holder. Selenium, symbol Se, has a Simple Monoclinic structure and Gray color. In the periodic table, the elements are listed in order of increasing atomic number Z. A vertical column in the periodic table. Subsequently, selenium and various selenium compounds have been used in a variety of photoconductor and photovoltaic applications. Selenium is a non-metallic element that carries the chemical atomic number 34. The chemical symbol for Hydrogen is H. With a standard atomic weight of circa 1.008, hydrogen is the lightest element on the periodic table. Both sulfur and arsenic have some healing properties, and since neighbors in the periodic table have similar properties, it is not surprising that selenium seems to influence human health. But for horses, with their more limited diet, selenium deficiency is common and often corrected with dietary supplements. Germanium is a lustrous, hard, grayish-white metalloid in the carbon group, chemically similar to its group neighbors tin and silicon. Gallium does not occur as a free element in nature, but as gallium(III) compounds in trace amounts in zinc ores and in bauxite. The chemical symbol for Sulfur is S. Sulfur is abundant, multivalent, and nonmetallic. Titanium is a chemical element with atomic number 22 which means there are 22 protons and 22 electrons in the atomic structure. The tendency of an atom to attract electrons towards itself, expressed on a relative scale. These muds can be processed by a number of means to obtain free selenium. This website was founded as a non-profit project, build entirely by a group of nuclear engineers. Most of these seem to indicate that if it is effective at all, it works somehow in conjunction with vitamin E, which, like selenium, plays an antioxidant role in the body. The nucleus consists of 34 protons (red) and 46 neutrons (blue). Download our free Periodic Table app for mobile phones and tablets. The chemical symbol for Americium is Am. Density (g cm−3) Bond enthalpy (kJ mol−1)A measure of how much energy is needed to break all of the bonds of the same type in one mole of gaseous molecules. Some elements exist in several different structural forms, called allotropes. Discoverer: Davy, Sir H. and Thénard, L.-J. Selenium is a other nonmetal element. The chemical symbol for Krypton is Kr. Tungsten is an intrinsically brittle and hard material, making it difficult to work. Most widespread minerals containing Selenium; This list of minerals containing Selenium is built from the locality database. It is even less abundant than the so-called rare earths. Its electronic configuration is 1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p4 or it can be written as [Ar] 3d10 4s2 4p4. 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. There have been numerous studies, none of them very conclusive, about the possible role of selenium in cancer prevention, and in increasing the efficacy of chemotherapy. It is by mass the most common element on Earth, forming much of Earth’s outer and inner core. Find Selenium Chemical Element Sign Atomic Number stock images in HD and millions of other royalty-free stock photos, illustrations and vectors in the Shutterstock collection. Element Selenium (Se), Group 16, Atomic Number 34, p-block, Mass 78.971. This Site has been carefully prepared for your visit, and we ask you to honour and agree to the following terms and conditions when using this Site. The total electrical charge of the nucleus is therefore +Ze, where e (elementary charge) equals to 1,602 x 10-19 coulombs. As the most electronegative element, it is extremely reactive: almost all other elements, including some noble gases, form compounds with fluorine. Our bodies contain about 14 milligrams, and every cell in a human body contains more than a million selenium atoms. In excess it is carcinogenic and teratogenic (disturbs the development of an embryo or foetus). Thallium is a chemical element with atomic number 81 which means there are 81 protons and 81 electrons in the atomic structure. Selenium: Symbol: Se: Atomic Number: 34: Atomic Mass: 78.96 atomic mass units Number of Protons: 34: Number of Neutrons: 45: Number of Electrons: 34: Melting Point: 217.0° C: Boiling Point: 684.9° C: Density: 4.79 grams per cubic centimeter: Normal Phase: … © 2019 / see also The chemical symbol for Iridium is Ir. It has 2 electrons in K – shell, 8 electrons in L – shell, 18 electrons in M – … Its symbol is Se and belongs to the group of nonmetals and its habitual state in nature is solid. The image is of a crescent moon against a cratered surface. Einsteinium is the seventh transuranic element, and an actinide. Each entry has a full citation identifying its source. The chemical symbol for Lawrencium is Lr. The chemical symbol for … Block Aluminium is a silvery-white, soft, nonmagnetic, ductile metal in the boron group. While some of the allotropic forms of selenium resemble those that we know well from study of sulphur, there are others that are different. Bismuth is a brittle metal with a silvery white color when freshly produced, but surface oxidation can give it a pink tinge. Covalent radiusHalf of the distance between two atoms within a single covalent bond. Krypton has been portrayed consistently as having been destroyed just after Superman's flight from the planet, with exact details of its destruction varying by time period, writers and franchise. The role of the element in humans, animals and plants. Under standard conditions, it is the lightest metal and the lightest solid element. In nuclear industry, especially natural and artificial samarium 149 has an important impact on the operation of a nuclear reactor. High = substitution not possible or very difficult. What is Atomic Number Density - Definition. Selenium is known to have over 20 different isotopes; however, only 5 of them are stable. 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. The RSC has been granted the sole and exclusive right and licence to produce, publish and further license the Images. Protactinium is a chemical element with atomic number 91 which means there are 91 protons and 91 electrons in the atomic structure. 113Cd has specific absorption cross-section. Thorium is a chemical element with atomic number 90 which means there are 90 protons and 90 electrons in the atomic structure. Selenium definition, a nonmetallic element chemically resembling sulfur and tellurium, occurring in several allotropic forms, as crystalline and amorphous, and having an electrical resistance that varies under the influence of light. Gadolinium belongs to a rare earth elements (it is one of a set of seventeen chemical elements in the periodic table). Selenium is a chemical element with atomic number 34 and symbol Se. Chromium is a steely-grey, lustrous, hard and brittle metal4 which takes a high polish, resists tarnishing, and has a high melting point. … Period Atomic Number 34 Learn more about the atomic number. All of its isotopes are radioactive. Yttrium is a chemical element with atomic number 39 which means there are 39 protons and 39 electrons in the atomic structure. Selenium (atomic symbol: Se, atomic number: 34) is a Block P, Group 16, Period 4 element with an atomic radius of 78.96. But the diversity of uses of selenium does not stop with shampoo and horse food supplements and photovoltaics. In the human body, selenium content ranges betwe… Because of its high chemical reactivity, barium is never found in nature as a free element. The percentage of a commodity which is recycled. From periodic table ,we see that the atomic number of selenium is 34. 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. Rubidium is a chemical element with atomic number 37 which means there are 37 protons and 37 electrons in the atomic structure. The selenium atom has a radius of 120 pm and a Van der Waals radius of 190 pm. The chemical symbol for Lanthanum is La. 34 2) Write the full electron configuration for selenium following the (n+l) rule? Tellurium is chemically related to selenium and sulfur. It is also sometimes considered the first element of the 6th-period transition metals and is traditionally counted among the rare earth elements. Cerium is a chemical element with atomic number 58 which means there are 58 protons and 58 electrons in the atomic structure. Its density is about 70% higher than that of lead, and slightly lower than that of gold or tungsten. Selenium (Se). The images may not be posted on any website, shared in any disc library, image storage mechanism, network system or similar arrangement.

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