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Atomic Number: 34
Se
Se

Selenium

78.9710 u

Category

nonmetal

State at Room Temperature

solid

Electron Configuration

1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁴

Valence Electrons

6

Lewis Dot:••••••

Electronegativity

2.55

Pauling scale

Oxidation States

-2+2+4+6

Melting Point

494 K

220.85°C

Boiling Point

958 K

684.85°C

Density

4.809

g/cm³

Position in Table

Group 16Period 4p-block

Discovery

Historical Information

Discovered byJöns Jacob Berzelius
Year1817

Common Uses

Applications & Industries

Glass manufacturing, electronics, photocells, dietary supplement

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