WebQ: Classify the following elements as a metal, nonmetal, and a metalloid. 1.) hydrogen…. A: Metal is the element that readily forms cations and shows properties like conductivity, luster,…. Q: Which elements are alkaline earth metals? (a) rubidium (b) tungsten (c) magnesium (d) cesium (e)…. Webmetal element that is shiny, malleable, good conductor of heat and electricity metalloid element that conducts heat and electricity moderately well, and possesses some …

22: Chemistry of the Nonmetals - Chemistry LibreTexts

WebSelenium is a non-metal and can be compared chemically to its other non-metal counterparts found in Group 16: The Oxygen Family, such as sulfur and tellurium. Discovered by von Reichenstein in 1782, tellurium is a brittle metalloid that is relatively rare. It is named from the Latin tellus for "earth". WebJun 8, 2024 · Selenium is a nonmetal found in rocks, soil, and food; fruits, vegetables, and animal protein are the main sources of the element. Selenium is involved in several biological pathways as an integral component of selenoproteins such as glutathione peroxidase, an enzyme that scavenges for ROS and plays an important role in oxidative … arman ardalan

2.11: Metals, Nonmetals, and Metalloids - Chemistry LibreTexts

WebIn chemistry, a nonmetal (or non-metal) is a chemical element that generally lacks a predominance of metallic properties; they range from colorless gases (like hydrogen) to … WebApr 11, 2024 · HIGHLIGHTS. who: March and colleagues from the Central South University, China have published the Article: Selenium speciation-dependent cancer radiosensitization by induction of G2/M cell cycle arrest and apoptosis, in the Journal: (JOURNAL) what: In this paper, the antitumor effects of four different forms of selenium compounds combined … Selenium is a chemical element with the symbol Se and atomic number 34. It is a nonmetal (more rarely considered a metalloid) with properties that are intermediate between the elements above and below in the periodic table, sulfur and tellurium, and also has similarities to arsenic. It seldom occurs in its elemental … See more Physical properties Selenium forms several allotropes that interconvert with temperature changes, depending somewhat on the rate of temperature change. When prepared in chemical reactions, … See more Selenium (Greek σελήνη selene meaning "Moon") was discovered in 1817 by Jöns Jacob Berzelius and Johan Gottlieb Gahn. Both chemists … See more Selenium is most commonly produced from selenide in many sulfide ores, such as those of copper, nickel, or lead. Electrolytic metal refining is particularly productive of selenium as a … See more In high concentrations, selenium acts as an environmental contaminant. Sources of pollution include waste materials from certain mining, … See more Selenium compounds commonly exist in the oxidation states −2, +2, +4, and +6. Chalcogen compounds Selenium forms two See more Native (i.e., elemental) selenium is a rare mineral, which does not usually form good crystals, but, when it does, they are steep rhombohedra or tiny acicular (hair-like) crystals. Isolation of selenium is often complicated by the presence of other compounds and … See more Fertilizers Researchers found that application of selenium fertilizer to lettuce crops decreased the … See more balsa medusa gericault