Selenium Selenium is a chemical element with symbol Se and atomic number 34. Selenium (Se). A group or a family is each column on the periodic table. Density: 4.809 grams per cubic centimeter 5. Density (g cm−3) The most common ore of selenium are the sulfide ores. The nucleus consists of 34 protons (red) and 46 neutrons (blue). The origin of the name comes from the Greek word selene meaning moon. Values are given for typical oxidation number and coordination. Electron configuration It is a nonmetal with properties that are intermediate between those of its periodic table column-adjacent chalcogen elements sulfur and tellurium. Berzelius found that selenium was present in samples of tellurium and gave that element its characteristic smell. So much for trying to do a "wikipedia" search for this "hidden" element! But it's not all bad news. Know what is Selenium, Chemical Properties of Selenium, Atomic Mass, and more at BYJU'S Selenium is a chemical element with symbol Se and atomic number 34. Isotopes of an element are atoms that have the same atomic numbers but a different number of neutrons (different mass numbers) in their nuclei. Chemical element of periodic table. It is indicated by the symbol Se and the atomic number of selenium is 34. 2020-12-26. This element is vital for living creatures and things, but just in micro doses, and in excess doses it can cause cancer or serious intoxication. Phase at Room Temperature: Solid. Selenium is one of those all too common elements that is essential to life in small quantities, and very toxic in larger quantities. Block Selenium (atomic symbol: Se, atomic number: 34) is a Block P, Group 16, Period 4 element with an atomic radius of 78.96. Classified as a nonmetal, Selenium is a solid at room temperature. The chemical symbol for selenium is Se. The element is named after Selene, the Greek goddess of the moon. Medium = substitution is possible but there may be an economic and/or performance impact Selenium is a other nonmetal element. Political stability of top reserve holder. Selenium is used to make pigments for ceramics, paint and plastics. He also became affected by it personally – it can be absorbed through the skin – and it caused him to experience the bad breath associated with those who work with this element. For a wider selection of images connected with Selenium, see Category:Selenium. Period 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. But I save the best occurrence of selenium in nature for last. Commercial use of the Images will be charged at a rate based on the particular use, prices on application. 2005-08-08. Selenium chemical element. Density is the mass of a substance that would fill 1 cm3 at room temperature. Here are the properties of selenium, according to the Jefferson Lab: 1. Selenium chemical element. The selenium atom has a radius of 120 pm and a Van der Waals radius of 190 pm. 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 temperature at which the solid–liquid phase change occurs. Each entry has a full citation identifying its source. Selenium is considered to be a nonmetal. It is a soft metalloid similar to sulfur, unaffected by water and soluble in alkalis and nitric acid. Electron affinityThe energy released when an electron is added to the neutral atom and a negative ion is formed. It has 34 protons and 34 electrons and a mass number of 78.96. 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. You get the number of neutrons by subtracting the atomic number from the mass (80). Selenium has both a photovoltaic action (converts light to electricity) and a photoconductive action (electrical resistance decreases with increased illumination). Sign with atomic number and atomic weight. It has the atomic number 34 in the periodic table. Selenium has atomic number 34, meaning each atom has 34 protons. A measure of the propensity of a substance to evaporate. Selenium Element: Selenium is the chemical in the 16th group and 4th period of the periodic table. Melting point of Selenium is 217 °C and its the boiling point is 685 °C. Selenium is found in a few rare minerals. The selenium atom has a radius of 120 pm and a Van der Waals radius of 190 pm. Selenium is not commonly found in its free or elemental form. Atomic weight of Selenium is 78.971 u or g/mol. This is approximately the sum of the number of protons and neutrons in the nucleus. Uncombined elements have an oxidation state of 0. The arrangements of electrons above the last (closed shell) noble gas. it exists in the form of ores and minerals. 96 @inproceedings{WinSeleniumA, title={Selenium : Atomic Number 34 , Mass Number 78 . Selenium, isotope of mass 75. At one time virtually all copying machines used selenium ; this has now been largely replaced by organic photoconductors. The temperature at which the liquid–gas phase change occurs. The description of the element in its natural form. Boiling point In fact a little investigation showed me that it was perfectly safe in small amounts. Element 34 of Periodic table is Selenium with atomic number 34, atomic weight 78.96. 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. Sign with atomic number and atomic weight. This is approximately the sum of the number of protons and neutrons in the nucleus. These values were determined using several different methods. It was first observed by the Swedish scientist Jons Jacob Berzelius. Selenium is a chemical element. 3 Chemical and Physical Properties Expand this section. Selenium (atomic number 32, symbol Se) is a nonmetal and a chemical element that is added to dietary supplements and is an essential mineral.

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