| Property | Value |
|---|---|
| Atomic number | 34 |
| Atomic weight | 78.963 amu |
| Element family | Non-metals |
| Electronic configuration | 1s2 |
| Stable and very long lived isotopes | 74Se: 0.9%, 76Se: 9.0%, 77Se: 7.6%, 78Se: 23.5%, 80Se: 49.6% |
| Previous element | Arsenic |
| Next element | Bromine |
| Density | 4.809 g/cm3 (STP) |
| Melting | 221 °C |
| Boiling | 685 °C |
| Covalent radius | 1.16 Å |
| Van der Waals radius | 1.9 Å |
| Ionic radius | 0.5 Å |
| First ionization potential | 9.753 eV |
| Electron affinity | 2.021 eV |
| Electronegativity | 2.55 |
| Discovery year | 1817 |
| Sample reactions |
|---|
| Se + BrF5 = SeF6 + BrF3 |
Selenium is an element number 34 from non-metals family. Its symbol is Se. Selenium atomic weight is 78.963 amu. Se stable and long lived isotopes are 74Se: 0.9%, 76Se: 9.0%, 77Se: 7.6%, 78Se: 23.5%, 80Se: 49.6%. Selenium electronic configuration is 1s22s22p63s23p63d104s24p4. Sample compounds that contain Selenium are Mn2Se7, H2Se, Na2SeO3, SeOBr2, SeO2, H2SeO3.
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