Atomic Number20Molar Mass40.08 gmol-1
Electron Configuration[Ar]4s2Normal Statesolid metal
Density @STP1.55 g cm-3Melting Point842oC
Boiling Point1484oCStable Isotopes40Ca, 42Ca, 43Ca, 44Ca, 46Ca, 48Ca
Atomic Radius197 pmIonic Radius100 (2+) pm
Electronegativity (Pauling)1Ionization Energy (1st)590 kJ mol-1
Ionization Energy (2nd)1145 kJ mol-1Ionization Energy (3rd)4910 kJ mol-1
Molar Heat Capacity25.9J K-1mol-1Standard Molar Entropy41.6 J K-1mol-1
Enthalpy of Fusion9.33 kJ mol-1Enthalpy of Vapourization149.95 kJ mol-1
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