#wikipedia.org. selenium. Selenium is a chemical element; it has the 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 form. It seldom occurs in this elemental state or as pure ore compounds in Earth's crust. Selenium (from Ancient Greek σελήνη (selḗnē) 'moon') was discovered
  • atomic # 34
  • Symbol: Se
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