34
Se
Selenium
78.963
2
8
18
6
| Property | Value |
|---|
| Atoomnummer | 34 |
| Atoomgewicht | 78.963 amu |
| Element family | Niet-metalen |
| Elektronische configuratie | 1s22s22p63s23p63d104s24p4 |
| Stable and very long lived isotopes | 74Se: 0.9%, 76Se: 9.0%, 77Se: 7.6%, 78Se: 23.5%, 80Se: 49.6% |
|
| Previous element | Arsenicum |
| Next element | Broom |
| Dichtheid |
4.809 g/cm3 (STP) |
| Smelten | 221 °C |
| Kookpunt | 685 °C |
| Covalente straal | 1.16 Å |
| Van der Waals straal | 1.9 Å |
| Ionstraal | 0.5 Å |
| Eerst ionisatiepotentiaal | 9.753 eV |
| Elektronenaffiniteit | 2.021 eV |
| Electronegativity | 2.55 |
| Discovery year | 1817 |
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