Calcium (Ca) » Innovachem

Isotope	Z(p)	N(n)	Atomic Mass	Natural Abundance	Enrichment Level	Chemical Form
Ca-40	20	20	39.9625912	96.941%	99.99%	Carbonate
Ca-42	20	22	41.9576183	0.647%	68.00-96.80%	Carbonate
Ca-43	20	23	42.958767	0.135%	62.20-90.00%	Carbonate
Ca-44	20	24	43.955481	2.086%	94.50-99.00%	Carbonate
Ca-46	20	26	45.953693	0.004%	15.90-24.80%	Carbonate
Ca-48	20	28	47.952533	0.187%	64.00-97.10%	Carbonate

Name	Calcium
Symbol	Ca
Atomic number	20
Atomic weight	40.078
Standard state	Solid at 298 °K
CAS Registry ID	7440-70-2
Group in periodic table	2
Group name	Alkaline earth metal
Period in periodic table	4
Block in periodic table	s-block
Color	Silvery white
Classification	Metallic
Melting point	851 °C
Boiling point	1484 °C
Thermal conductivity	200 W/(m·K)
Electrical resistivity	3.43 µΩ·cm at 0 °C
Electronegativity	1.0
Specific heat	0.647 J/g·K at 20 °C
Heat of vaporization	155 kJ·mol^-1
Heat of fusion	8.54 kJ·mol^-1
Density of solid	1.54 g/cm³
Electron configuration	[Ar]4s²
Ionic radius	1.06 Å (Ca²⁺)
Oxidation state	+2
Standard electrode potential	Eº = -2.87V