Elektronische Daten		Thermische Daten		Sterische Daten
Schalen: 2,8,8,2 Orbitale: [Ar] 4s2 Elektronegativität: 1.0, 1.0 1. Ionization potential: 6.1132 eV 2. Ionization potential: 11.871 eV 3. Ionization potential: 50.908 eV Oxidation states: 2 Electrical conductivity: 0.298 10^6		Melting point: 839 °C Boiling point: 1484 °C Specific heat: 0.63 J/gK Heat of fusion: 8.540 kJ/mol Heat of vaporization: 153.60 kJ/mol Thermal conductivity: 2.00 W/cmK		Atomic radius: 2.23 Å Ionic radius: 1.00 Å () Covalent radius: 1.74 Å Atomic volume: 25.9 cm³/mol Density (293 K): 1.55 g/cm³ Crystal structure: Kubisch flächenzentriert

Nuklid	Häufigkeit [%]	Masse	Spin	Halbwertszeit	Zerfallsmodus	Zerfallsreihe
40Ca	96.97	39.9626	0	--	stabil	--
41Ca	0	41	7/2	1.03E05y	EC	View
42Ca	0.64	41.9586	0	--	stabil	--
43Ca	0.145	42.9588	7/2	--	stabil	--
44Ca	2.06	43.9555	0	--	stabil	--
45Ca	0	44.956	7/2	162.7d	-	View
46Ca	0.0033	45.9537	0	--	stabil	--
47Ca	0	46.954	7/2	4.536d	-	View
48Ca	0.18	47.9525	0	--	stabil	--
49Ca	0	49	3/2	8.72m	-	View

Legende

Herkunft des Namen:	latein: calx, calcis (Kalk)
Beschreibung:	Fairly hard, silvery-white metal. Fifth most abundant element in the earth's crust (41,500 ppm). Occurs only in compounds.
Entdeckt von:	Sir Humphrey Davy
Jahr:	1808
Ort:	England
Quelle(n):	Obtained from minerals like chalk, limestone & marble. Pure metal is produced by replacing the calcium in lime (calcium carbonate, CaCO3) with aluminium in hot, low pressure retorts.
Verwendung(en):	Used by many forms of life to make shells and bones. Virtually no use for the pure metal, however two of its compounds are, lime (CaO) and gypsum (CaSO4), are in great demand by a number of industries.