Element: Calcium (Ca)

Element (Atom) NameCalcium
Physical state at room temperatureSolid
Element ClassificationMetal
Group NameAlkaline Earth Metal
Group number (Periodic table)2
Period Number (Periodic table) 4
Atomic number20
Atomic weight40.078 (Ref: Jlab-ele020, Ciaaw-calcium, Nist-20)
40.08 (Ref: Lanl-20)
Atomic Radius231 pm (Van der Waals) (Ref: Lanl-20)
Density1.54 g/cm3 (Ref: Jlab-ele020)
Melting point842°C (Ref: Jlab-ele020, Lanl-20)
Boiling point1484°C (Ref: Jlab-ele020, Lanl-20)
Electron shell configuration1s2 
2s2 2p6 
3s2 3p6
Oxidation States+2 (Ref: Jlab-ele020)
+2, +1 ​(a strongly basic oxide) (Ref: Lanl-20)
Ionization Energy6.113 eV (Ref: Jlab-ele020)6.11315547  eV (Ref: Nist-20)
Number of Stable Isotopes
InChI1S/Ca (Ref: Pubchem-20)

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