Atomic number 20Ca
Calcium
ক্যালসিয়াম
- Alkaline earth metal
- Group 2
- Period 4
- Atomic mass 40.078 u
- Solid
- Electrons per shell
- 2, 8, 8, 2
- Electron configuration
- 1s2 2s2 2p6 3s2 3p6 4s2
- Nucleus
- 20 protons, 20 neutrons
- Valence electrons
- 2
Speed1×
- Group
- 2
- Period
- 4
- Block
- s-block
- Category
- Alkaline earth metal
- State at 25 °C
- Solid