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