- A chemical element whose atomic number is 34. It has several allotropic forms, and may be a red amorphous powder, consist of red crystals, or occur in the form of gray metallic crystals, among others. It has over 25 known isotopes, of which 5 are stable. It has many applications in electronics, including its use in photocells, batteries, rectifiers, TV cameras, photography, and semiconductors. Its chemical symbol is Se.
- chemical symbol Se
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