20Ca
Calcium
칼슘 · カルシウム
Alkaline earth
Atomic number20
ElementCa — Calcium
Atomic mass40.078
CategoryAlkaline earth
Group2
Period4
Electron config[Ar] 4s2
Shells2,8,8,2
State (RT)Solid
Melting pt842°C
Boiling pt1484°C
Electronegativity1
Discovered1808
Main usesCement, bones, dietary supplement
2 · 8 · 8 · 2