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Se
Selenium
#34 · Reactive Nonmetal
| Mass | 78.971 u |
| Density | 4.809 g/cm³ |
| Melting | 494.0 K |
| Boiling | 958.0 K |
| Electronegativity | 2.55 |
| Ionization Energy | 941.0 kJ/mol |
| Atomic Radius | 103.0 pm |
| Block | p-block |
| State (RT) | Solid |
| Config | [Ar] 3d10 4s2 4p4 |