Selenium

Atom properties

Radii


Atomic radius (Å): 1.19 (2-coordinate covalent radius) [1]
1.40 (12-coordinate) [1]
Ionic radius (Å): Se(-II): 1.98 [1]
Se(IV): 0.50 [1]
Se(VI): 0.42 [1]


Electron configuration


Ground state: 1s2-2s2-2p6-3s2-3p6-3d10-4s2-4p4