20Ca
Calcium
Alkaline Earth MetalCalcium (Ca) is element 20, an alkaline earth metal, in period 4 and group 2 of the periodic table. Its standard atomic weight is 40.078, it melts at 842 °C and boils at 1484 °C. Discovered by Humphry Davy, 1808.
Atomic Number20
SymbolCa
NameCalcium
Atomic Weight40.078 u
CategoryAlkaline Earth Metal
Period4
Group2
Melting Point842 °C
Boiling Point1484 °C
Density1.55 g/cm³
Electron Config[Ar] 4s2
Discovered ByHumphry Davy, 1808