Strontium |
Symbol | Sr |
---|---|
Latin name | Strontium |
Atomic number | 38 |
Period | 5 |
Element category | Alkaline earth metals |
Relative atomic mass | 87.62 |
Group | II.A |
Electronegativity | 1.0 |
Oxidation numbers | 2 |
Electron configuration | 1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 5s2 |
Density [g/cm3] | 2.6 |
State | Solid |
Melting point [°C] | 769 |
Boiling point [°C] | 1384 |
Atomic radius [pm] | 219 |
Covalent radius [pm] | 182 |
Thermal conductivity [W m-1K-1] | 35.3 |
Heat capacity [J K-1g-1] | 0.3 |
Discovery | 1790 |
Hardness [Mohs scale] | 1.8 |
Electrical conductivity [S m-1] | 2 · 106 |
1.st ionization energy [eV] | 5.6948 |
2.nd ionization energy [eV] | 11.03 |
3.rd ionization energy [eV] | 43.6 |
Stable isotopes | 4 |
Unstable isotopes | 13 |