20 Ca
Alkaline earth metal
Calcium
Builds bones and teeth.
Properties of Calcium
- Atomic number (Z)
- 20
- Symbol
- Ca
- Atomic mass
- 40.078 g/mol
- Category
- Alkaline earth metal
- Group
- 2
- Period
- 4
- Electron configuration
- [Ar] 4s²
- Electronegativity (Pauling)
- 1
- Atomic radius
- 194 pm
- First ionization energy
- 590 kJ/mol
- Melting point
- 1115 K (841.9 °C)
- Boiling point
- 1757 K (1483.8 °C)
- Density
- 1.55 g/cm³
- Phase at 25 °C
- Solid
- Discovered
- Discovered in 1808