calcium

Symbol: Ca
Atomic number: 20
Atomic weight: 40.078
Group: 2
Group name: Alkaline earth metal
Period: 4
Block: s
CAS ID: 7440-70-2
Shell structure: 2.8.8.2
Electron configuration: [Ar].4s2
State: |standardstate|
Melting point: 1115 [or 842 °C (1548 °F)]
Boiling point: 1757 [or 1484 °C (2703 °F)]
Ionization energy/kJ per mol: 589.8
Common oxidation states: 2
Pauling electronegativity: 1.00