Atomic Number 20     Atomic Mass 40.078     Density 1.54 g/mL

State solid     Color silvery white     Electronegativity 1

Melting Point 839°C     Boiling Point 1484°C

Natural Isotopes Ca-40 96.941%   Ca-42 0.641%   Ca-43 0.135%
Ca-44 2.086%   Ca-46 0.004%   Ca-48 0.187%

Abbreviated Electron Configuration [Ar] 4s²

Discovered by Sir Humphrey Davy in 1808.