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Selenium
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| Atomic Number: |
34 |
| Atomic Weight: |
78.96 |
| Element Type: |
Non-Metal |
| Crystal Structure: |
Hexagonal |
| Melting Point: |
221.0°C = 429.8°F = 494.15 K |
| Boiling Point: |
685.0°C = 1265.0°F = 958.15 K |
| Critical Temp: |
1493.0°C = 2719.4°F = 1766.15 K |
| Atomic Radius: |
1.22 Å (Å = Angstrom = 10-10 m) |
| Covalent Radius: |
1.16 Å |
| Electronegativity: |
2.55 |
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History
(Gr. Selene, moon) Discovered by Berzelius in 1817, who found it associated withtellurium, named for the earth.
Sources
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