Group2 Melting point842°C, 1548°F, 1115 K
Period4 Boiling point1484°C, 2703°F, 1757 K
Blocks Density (g cm−3)1.54
Atomic number20 Relative atomic mass40.078
State at 20°CSolid Key isotopes40Ca
Electron configuration[Ar] 4s2 CAS number7440-70-2