Stable isotope Calcium (Ca)

 
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

Properties of Calcium

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