Element overview
Calcium (Ca) is element 20 with a listed atomic mass of 40.078 u. It is in group 2 and period 4. Its category is alkaline earth metal.
Atomic properties
Electron configuration: [Ar] 4s2. Electronegativity: 1. Common oxidation states: +2.
Physical properties
Density: 1.55; melting point: 1115; boiling point: 1757. Values depend on conditions, phase and source.