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 |