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
Frequently asked questions
What is Calcium?
Calcium (Ca) is an alkaline earth metal, element number 20 on the periodic table. Builds bones and teeth.
What is the atomic number and atomic mass of Calcium?
Calcium has atomic number 20 and an atomic mass of about 40.078 g/mol.
What is the electron configuration of Calcium?
The electron configuration of Calcium is [Ar] 4s².
Where is Calcium on the periodic table?
Calcium sits in group 2, period 4, and is classified as a alkaline earth metal.