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Selenium (Se)
Atomic number 34 · Non-metal
| Atomic number | 34 |
|---|---|
| Atomic mass | 78.971 u |
| Molar mass | 78.971 g/mol |
| Category | Non-metal |
| Group / period / block | 16 / 4 / p |
| Electron configuration | [Ar] 3d10 4s2 4p4 |
| Electrons per shell | 2, 8, 18, 6 |
| Electronegativity (Pauling) | 2.55 |
| Atomic radius | 115.0 pm |
| Density | 4.809 g/cm³ |
| First ionisation energy | 9.7524 eV |
| Melting point | 493.95 K (220.80 °C) |
| Boiling point | 958.15 K (685.00 °C) |
| Common oxidation states | -2, +2, +4, +6 |
| Abundance in Earth's crust | 0.05 ppm |
Uses
Glass colouring, solar cells, photocopiers
Discovery
1818, Jöns Berzelius