Selenium can be prepared with either an amorphous or a crystalline structure. That was Cambridge University's Bernie Bulkin with the story of Selenium. Boiling point
In excess it is carcinogenic and teratogenic (disturbs the development of an embryo or foetus). The number of atoms of the element per 1 million atoms of the Earth’s crust. The transition of a substance directly from the solid to the gas phase without passing through a liquid phase. The transition of a substance directly from the solid to the gas phase without passing through a liquid phase. The treatment for this was a shampoo containing selenium sulphide, surprising to me because I thought that selenium was highly toxic. It can convert AC electricity to DC electricity.
The energy released when an electron is added to the neutral atom and a negative ion is formed. Selenium is an essential trace element for some species, including humans. He had shares in a sulfuric acid works and he was intrigued by a red-brown sediment which collected at the bottom of the chambers in which the acid was made. Please enable JavaScript to access the full features of the site. Density is the mass of a substance that would fill 1 cm3 at room temperature.
These blocks are named for the characteristic spectra they produce: sharp (s), principal (p), diffuse (d), and fundamental (f). 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. red selenium has here sub-forms, alpha, beta and gamma. Members of a group typically have similar properties and electron configurations in their outer shell. These values were determined using several different methods. Yum! The temperature at which the liquid–gas phase change occurs. Click here to view videos about Selenium, It’s Elemental - The Periodic Table of Elements. Electronegativity (Pauling scale)The tendency of an atom to attract electrons towards itself, expressed on a relative scale. Elements are organised into blocks by the orbital type in which the outer electrons are found. 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. It was first observed by the Swedish scientist Jons Jacob Berzelius. This is approximately the sum of the number of protons and neutrons in the nucleus. In no event shall the RSC be liable for any damages including, without limitation, indirect or consequential damages, or any damages whatsoever arising from use or loss of use, data or profits, whether in action of contract, negligence or other tortious action, arising out of or in connection with the use of the material available from this Site. Selenium is a chemical element that is placed in the oxygen group of the periodic table. Sublimation
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). If you wish to use the Images in a manner not permitted by these terms and conditions please contact the Publishing Services Department by email. Where the element is most commonly found in nature, and how it is sourced commercially. 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. Period. 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… Log in, This site uses cookies to improve your experience. Interactive periodic table with up-to-date element property data collected from authoritative sources. Periodic Table of Elements Element Selenium - Se. These values were determined using several different methods. A measure of the propensity of a substance to evaporate. Half of the distance between two unbonded atoms of the same element when the electrostatic forces are balanced. Classified as a nonmetal, Selenium is a solid at room temperature. This WebElements periodic table page contains diselenium hexasulphide for the element selenium Production. Commercial use of the Images will be charged at a rate based on the particular use, prices on application. Indeed, the newest and most promising class of mass produced solar cells are copper indium gallium selenide. 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: 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: … Tellurium had already been discovered, and named after the Greek word for earth, so he named selenium using the Greek word for moon. CAS number
The atomic number of each element increases by one, reading from left to right. 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 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 was discovered by Jöns Jacob Berzelius at Stockholm in 1817. The availability of suitable substitutes for a given commodity.
The RSC has been granted the sole and exclusive right and licence to produce, publish and further license the Images. Selenium is a non-metal and is sometimes considered as a metalloid. 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. Welcome to "A Visual Interpretation of The Table of Elements", the most striking version of the periodic table on the web. The arrangements of electrons above the last (closed shell) noble gas. The higher the value, the larger risk there is to supply. It is used to make photocells. A horizontal row in the periodic table. We know selenium is there, right under sulfur, in the periodic table, but it doesn't get much attention. Where more than one isotope exists, the value given is the abundance weighted average. It is therefore useful in photocells, solar cells and photocopiers. 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. And you can catch the facts about Krypton, rather than the fiction with Angleos Michaelides at next week's Chemistry in its Element. Murray Robertson is the artist behind the images which make up Visual Elements. Tellurium, its dioxide, and its tetrachloride are strong catalysts for air oxidation of carbon above 500 °C. Where more than one isotope exists, the value given is the abundance weighted average. It is possible selenium was first observed in about the year 1300 by the alchemist Arnold of Villanova. High = substitution not possible or very difficult. 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. 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 element is named after Selene, the Greek goddess of the moon. The atomic number of each element increases by one, reading from left to right. Product #: gm466770373 $ 33.00 iStock In stock It is given by the ratio of the pressure on a body to the fractional decrease in volume. Again, this requires great care.
Large amount of selenium dioxide is used in the smelting and refining of various metals from their ores, especially manganese. Most of the world’s selenium is obtained from the anode muds produced during the electrolytic refining of copper.
And search more of iStock's library of royalty-free stock images that features Atom photos available for quick and easy download. It is given by the ratio of the shear stress to the shear strain. Selenium is found in a few rare minerals such as crooksite and clausthalite. Look up chemical element names, symbols, atomic masses and other properties, visualize trends, or even test your elements knowledge by playing a periodic table game! The biggest use of selenium is as an additive to glass. Data for this section been provided by the. This sample represents selenium in the "The Grand Tour of the Periodic Table" mineral collection from Jensan Scientifics. Atoms of the same element with different numbers of neutrons. Berzelius found that selenium was present in samples of tellurium and gave that element its characteristic smell. First ionisation energyThe minimum energy required to remove an electron from a neutral atom in its ground state. The temperature at which the solid–liquid phase change occurs. Selenium Element: Selenium is the chemical in the 16th group and 4th period of the periodic table. You do not have JavaScript enabled. Selenium, symbol Se, has a Simple Monoclinic structure and Gray color. View Nuclear Periodic Table View Isotopic & Isomeric Data . It decreases electrical resistance with increased illumination. Members of a group typically have similar properties and electron configurations in their outer shell. These blocks are named for the characteristic spectra they produce: sharp (s), principal (p), diffuse (d), and fundamental (f). Pornographic, defamatory, libellous, scandalous, fraudulent, immoral, infringing or otherwise unlawful use of the Images is, of course, prohibited. For more information on the Visual Elements image see the Uses and properties section below. The solid–liquid phase change occurs s selenium is used in selenium periodic table by ore from a neutral atom a... 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