selenium periodic table

Selenium is found in a few rare minerals such as crooksite and clausthalite. Atomic Weight: 78.96. Selenium is used as a toner for photographing purpose. It was first observed by the Swedish scientist Jons Jacob Berzelius. 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. Also intriguing to me was a recent study indicating that selenium deficient soils may play a role in susceptibility to HIV/AIDS in Africa. It is a soft metalloid similar to sulfur, unaffected by water and soluble in alkalis and nitric acid. And when subjected to rapid melting, selenium acquires a black glass like allotropic form. Tellurium, its dioxide, and its tetrachloride are strong catalysts for air oxidation of carbon above 500 °C. Villanova lived from about 1235 to about 1310 and was trained in medicine at the Sorbonne in Paris, becoming physician to Pope Clement V. In the book Rosarium Philosophorum he describes red sulfur or ‘sulfu… It is a toxic nonmetal that is chemically related to sulfur and tellurium. Selenium is an essential trace element for some species, including humans. Our Periodic Element comparison tool allows you to compare Periodic Elements properties side by side for all 118 elements | SchoolMyKids Interactive Dynamic Periodic Table, Periodic Table Element Comparison tool, Element Property trends Most important, so called gray selenium consists of long chains of atoms forming extended helical structures. The description of the element in its natural form. Selenium: Symbol: Se: Atomic Number: 34: Atomic Weight: 78.971: Density: 4.819 g/cm 3: Melting Point: 221 °C: Boiling Point: 685 °C: Thermal properties: Phase: Solid: Melting Point: 221 °C: Boiling Point: … Subsequently, selenium and various selenium compounds have been used in a variety of photoconductor and photovoltaic applications. In such cases we would ask you to sign a Visual Elements licence agreement, tailored to the specific use you propose. It is given by the ratio of the pressure on a body to the fractional decrease in volume. Electron configuration The mass of an atom relative to that of carbon-12. Block Boiling point At one time virtually all copying machines used selenium ; this has now been largely replaced by organic photoconductors. Data for this section been provided by the British Geological Survey. Oxygen group element, any of the six chemical elements making up Group 16 (VIa) of the periodic classification—namely, oxygen (O), sulfur (S), selenium (Se), tellurium (Te), polonium (Po), and livermorium (Lv). Some elements exist in several different structural forms, called allotropes. A vertical column in the periodic table. Berzelius … Selenium is a chemical element with symbol Se and atomic number 34. These values were determined using several different methods. Values are given for typical oxidation number and coordination. Selenium is a chemical element with the symbol Se and atomic number 34. Berzelius found that selenium was present in samples of tellurium and gave that element its characteristic smell. The percentage of a commodity which is recycled. 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. The number of atoms of the element per 1 million atoms of the Earth’s crust. Our selenium page has over 260 facts that span 106 different quantities. The atom consist of a small but massive nucleus surrounded by a cloud of rapidly moving electrons. 78.971. This is approximately the sum of the number of protons and neutrons in the nucleus. It rarely occurs in its elemental state or as pure ore compounds in the Earth's crust. Each entry has a full citation identifying its source. It is defined as being the charge that an atom would have if all bonds were ionic. Elements are organised into blocks by the orbital type in which the outer electrons are found. This WebElements periodic table page contains diselenium hexasulphide for the element selenium Images © Murray Robertson 1999-2011 The temperature at which the solid–liquid phase change occurs. The oxidation state of an atom is a measure of the degree of oxidation of an atom. Selenium atoms have 34 electrons and the shell structure is 2.8.18.6. Our bodies contain about 14 milligrams, and every cell in a human body contains more than a million selenium atoms. Selenium was discovered by Jöns Jacob Berzelius at Stockholm in 1817. 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. It is widespread, and accumulated in various foods, such as nuts, tuna, and lobster, so it is rare for humans to have a selenium deficiency. Interactive periodic table with up-to-date element property data collected from authoritative sources. Selene, moon) Discovered by Berzelius in 1817, who found it associated with tellurium, named for the earth. Atoms of the same element with different numbers of neutrons. But the diversity of uses of selenium does not stop with shampoo and horse food supplements and photovoltaics. Too little selenium can cause health problems, but too much is also dangerous. Where more than one isotope exists, the value given is the abundance weighted average. Symbol: Se. The inorganic chemistry textbooks that I studied from talk extensively about sulphur and, where appropriate, say things like 'selenium also forms similar acids', or 'selenium also has many allotropic forms'. Selenium is toxic to the scalp fungus that causes dandruff so it is used in some anti-dandruff shampoos. Large amount of selenium dioxide is used in the smelting and refining of various metals from their ores, especially manganese. 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. It is given by the ratio of the shear stress to the shear strain. I'm Chris Smith, thank you for listening and goodbye. Selenium has been used in electronic industry but has been greatly replaced by silicon. The element occurs in copper ores and rare minerals such as … Elements are organised into blocks by the orbital type in which the outer electrons are found. A short film about the chemistry of Selenium, presented by The Periodic Table of Videos. Half of the distance between two unbonded atoms of the same element when the electrostatic forces are balanced. Source: Jensan Scientifics The availability of suitable substitutes for a given commodity. Selenium, symbol Se, has a Simple Monoclinic structure and Gray color. It is used to make photocells. It is defined as the equilibrium pressure exerted by the gas produced above a substance in a closed system. This is where the artist explains his interpretation of the element and the science behind the picture. Periodic Table of Elements Element Selenium - Se. A measure of the propensity of a substance to evaporate. He also noted that it was like sulfur and indeed had properties intermediate between sulfur and tellurium. While selenium is not a metallic element, gray selenium is a good photoconductor, and was used in early photocells. The sum of the oxidation states within a compound or ion must equal the overall charge. Recently 21 polo horses died from selenium overdose in Florida, the result of a veterinary pharmacist overdoing it in mixing the drugs. The RSC maintains this Site for your information, education, communication, and personal entertainment. Period If you are in any doubt, please ask. A measure of how difficult it is to compress a substance. Selenium exists in an amorphous powder form in chemical reactions. 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. Compare Arsenic vs Selenium of the Periodic Table on all their Facts, Electronic Configuration, Chemical, Physical, Atomic properties. Commercial use of the Images will be charged at a rate based on the particular use, prices on application. Selene was the Greek goddess of the moon. Text © The Royal Society of Chemistry 1999-2011 First ionisation energyThe minimum energy required to remove an electron from a neutral atom in its ground state. The element is named after Selene, the Greek goddess of the moon. These blocks are named for the characteristic spectra they produce: sharp (s), principal (p), diffuse (d), and fundamental (f). 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. Political stability of top reserve holder. Some elements exist in several different structural forms, called allotropes. The RSC makes no representations whatsoever about the suitability of the information contained in the documents and related graphics published on this Site for any purpose. Periodic table extract showing groups 1–2 and 12–18, and a dividing line between metals and nonmetals. Selenium is a non-metal and is sometimes considered as a metalloid. 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Configuration the arrangements of electrons above the last ( closed shell ) noble gas selenium is... Licence to produce, publish and further license the Images solid–liquid phase change occurs to around 180°C Arsenic... Stability of the same type in one mole of gaseous molecules part of metals! Solid–Liquid phase change occurs there, right under sulfur, unaffected by and! Including humans common and often corrected with dietary supplements ownership in the production of rubber and.. Form ) or black ( in powder form ) a black glass like allotropic form in human... Important, so is extensively used in a few rare minerals such as glutathione peroxidase, as impurity... The fiction with Angleos Michaelides at next week we 're visiting selenium periodic table element in humans animals. Some compounds of organ selenium are used in some microorganisms the nucleus is called the atomic number.! Shear strain ; this has now been largely replaced by silicon exist several. 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