Atomic number 34Se
Selenium
সেলেনিয়াম
- Reactive non-metal
- Group 16
- Period 4
- Atomic mass 78.971 u
- Solid
- Electrons per shell
- 2, 8, 18, 6
- Electron configuration
- [Ar] 3d10 4s2 4p4
- Nucleus
- 34 protons, 46 neutrons
- Valence electrons
- 6
Speed1×
- Group
- 16
- Period
- 4
- Block
- p-block
- Category
- Reactive non-metal
- State at 25 °C
- Solid