| Selenium | |
| Elemental State | Se |
| Electron Configuration | 1s22s22p63s23p63d104s24p4 |
| First Ionization Potential | 9.752 eV |
| Electron Affinity | 2.021 eV |
| Z* | 8.287 (Clementi-Raimondi) |
| Pauling Electronegativity | 2.55 |
| Covalent Radius | 1.16 Å |
| Metallic Radius | |
| Ionic Radius | 1.84 Å Se2– coordination number = 6 |
| van der Waal's Radius | 1.90 Å |
| Melting Point | 221 oC |
| Boiling Point | 685 oC |
| Density | 4.79 g/cm3 |
| Other Properties | |