For other uses, see Calcium (disambiguation). 20 potassium ← calcium → scandium Mg ↑ Ca ↓ Sr periodic table General Name, Symbol, Number calcium, Ca, 20 Chemical series alkaline earth metals Group, Period, Block 2, 4, s Appearance silvery white Atomic mass 40.078(4) g/mol Electron configuration [Ar] 4s2 Electrons per shell 2, 8, 8, 2 Physical properties Phase solid Density (near r.t.) 1.55 g·cm−3 Liquid density at m.p. 1.378 g·cm−3 ...
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