Selenium is a chemical element; it has symbol Se and atomic number 34. It has various physical appearances, including a brick-red powder, a vitreous black solid, and a grey metallic-looking …

Selenium is an essential trace element for some species, including humans. Our bodies contain about 14 milligrams, and every cell in a human body contains more than a million selenium …

Selenium is a non-metal and is sometimes considered as a metalloid. There are various allotropic forms of selenium, that interconvert into each other with varying temperature.

Nov 21, 2020 · 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 …

Selenium is a chemical element of the periodic table with chemical symbol Se and atomic number 34 with an atomic weight of 78.9718 u and is classed as nonmetal and is part of group 16 …

Selenium has thirty-four protons and forty-six neutrons in its nucleus, and thirty-four electrons in four shells. It is located in group sixteen, period four and block p of the periodic table.

Selenium exists in several allotropic forms, although three are generally recognized. Selenium can be prepared with either an amorphous or a crystalline structure. The color of amorphous …

Selenium exists in several allotropic forms, although three are generally recognized. Selenium can be prepared with either an amorphous or a crystalline structure. The color of amorphous …

This WebElements periodic table page contains the essentials for the element selenium

Nov 18, 2025 · selenium (Se), a chemical element in the oxygen group (Group 16 [VIa] of the periodic table), closely allied in chemical and physical properties with the elements sulfur and …