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| Elements | SELENIUM 34 Se 78.96 (3)
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| Name: selenium | Group number: 16 |
| Symbol: Se | Group name: Chalcogen |
| Atomic number: 34 | Period number: 4 |
| Atomic weight: 78.96 (3) | Block: p-block |
| CAS Registry ID: 7782-49-2 | Voice:  |
| Standard state: solid at 298 K | Colour: grey, metallic lustre |
| Classification: Non-metallic | Availability: |
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