Calcium

Symbol | Ca
Latin name | Calcium
Atomic number | 20
Period | 4
Element category | Alkaline earth metals
Relative atomic mass | 40.078
Group | II.A
Electronegativity | 1.0
Oxidation numbers | 2
Electron configuration | 1s2 2s2 2p6 3s2 3p6 4s2
Density [g/cm3] | 1.55
State | Solid
Melting point [°C] | 839
Boiling point [°C] | 1484
Thermal conductivity [W m-1K-1] | 200
Heat capacity [J K-1g-1] | 0.647
Discovery | 1808
Hardness [Mohs scale] | 1.5-2
Brinell hardness [MPa] | 167
Young's modulus [GPa] | 20
Electrical conductivity [S m-1] | 3.13 · 107
Shear modulus [GPa] | 7.4
1.st ionization energy [eV] | 6.1132
2.nd ionization energy [eV] | 11.871
3.rd ionization energy [eV] | 50.908
Stable isotopes | 6
Unstable isotopes | 8