Seleen |
| Simbool | Se |
|---|---|
| Latynse naam | Selenium |
| Atoomgetal | 34 |
| Periode | 4 |
| Element kategorie | Nie-metale |
| Relatieve atomiese massa | 78.96 |
| Groep | VI.A |
| Electronegativiteit | 2.4 |
| Oksidering nommers | -2, 2, 4, 6 |
| Elektronkonfigurasie | 1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p4 |
| Digtheid [g/cm3] | 4.80 |
| Staat | Vaste stof |
| Smeltpunt [°C] | 217 |
| Kookpunt [°C] | 685 |
| Kritiese Punt [°C] | 1493 |
| Kritiese druk [MPa] | 27.2 |
| Termiese geleidingsvermoë [W m-1K-1] | 2.04 |
| Hitte kapasiteit [J K-1g-1] | 0.32 |
| Ontdekking | 1817 |
| Hardheid [Mohs-skaal] | 2.0 |
| Brinell-hardheid [MPa] | 736 |
| Young's modulus [GPa] | 10 |
| Elektriese geleiding [S m-1] | 8 · 106 |
| Shear modulus [GPa] | 3.7 |
| 1ste ionisasie-energie [eV] | 9.7524 |
| 2de ionisasie-energie [eV] | 21.19 |
| 3de ionisasie-energie [eV] | 30.82 |
| Stabiele isotope | 6 |
| Onstabiele isotope | 14 |