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Selenium

Symbol: Se
Atomic Mass/Weight: 78.96 AMU
Atomic Number: 34
Oxidation State (Bold Most Stable):  +4,-2,+6
Melting Point: 494 K
Boiling Point: 958 K
# of Isotopes: 6
Electron Configuration: [Ar] 3d10 4s2 4p4
Lewis Dot Diagram:
Selenium - Lewis Dot Diagram