Selenium
Chemical element
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Selenium is a chemical element; it has the symbol Se and atomic number 34. It 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... Wikipedia
Symbol: Se
Atomic number: 34
Atomic mass: 78.96 u
Electron configuration: [Ar] 3d¹⁰ 4s² 4p⁴
Charges: 2-
Appearance: grey metallic-looking, red, and vitreous black (not pictured) allotropes
Block: p-block
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