Selenium
Electron Configuration
|
General Properties
| Atomic Symbol | Se |
| Atomic Weight | 78.96 g/mol |
| Element Number | 34 |
| Standard State | Solid |
| Standard Type | Strongly Basic |
| Date of Discovery | 1817 |
| Discoverer | Berzelius |
Physical Properties
| Oxidation States | 4, -2,6 |
| Boiling Point | 958 K |
| Melting Point | 494 K |
| Density | 4.79 g/cm³ |
| Electron Configuration | [Ar]3d10,4s2,p4 |
| Acid/Base Properties | Acidic |
| Crystal Structure | Hexagonal |
| Electronegativity | 2.55 |
| Heat of Vaporization | 26.32 kJ/mol |
| Heat of Fusion | 5.54 kJ/mol |
| Electrical Conductivity | 8 10^6omg-¹cm-¹ |
| Thermal Conductivity | 2.04 Wm-¹K-¹ (at 300 K) |
| Specific Heat Capacity | 0.32 Jg-¹K-¹ (at 300 K) |
| First Ionization Potential | 9.752 |
| Atomic Volume | 16.50 cm³/mol |
| Atomic Radius | 1.40 Å |
| Covalent Radius | 1.16 Å |
| Synthetic | No |