Home 20 Ca Calcium back to the periodic table

Atomic number   20
Symbol   Ca
Atomic weight   40.078
Density [g/cm3]   1.54
Melting point [°C]   839
Boiling point [°C]   1487
1st Ionization energy [eV]   6.113
Electronic configuration   [Ar] 4s2
Oxidation number (most stable)   2
Atomic radius [pm]   197.3 (a)
Ionic radius [pm]   99 (2+)
Abundance in crustal rocks [ppm]   46600
Origin of the name   (lat.) calx = lime
Discovery   1808 by Humphry Davy
Uses   metallic calcium as alloying addition for babbitt metals and for hardening lead, in the form of calcium oxide as aggregate for the metallurgy and the production of glass.

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© 2004 Büro für angewandte Mineralogie · Dr. Stephan Rudolph · D-47918 Tönisvorst
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