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Selenium
#34 · I-Reactive Nonmetal
| I-Mass | 78.971 u |
| Uxinano | 4.809 g/cm³ |
| Uthuthu | 494.0 K |
| Ukomisa | 958.0 K |
| Electronegativity | 2.55 |
| Ionization energy | 941.0 kJ/mol |
| Atomic radius: | 103.0 pm |
| I-Block | p- iblock |
| Ilizwe (RT) | I-Solid |
| Qwalasela | [Ar] 3d10 4s2 4p4 |