Radium

Symbol | Ra
Latin name | Radium
Atomic number | 88
Period | 7
Element category | Alkaline earth metals
Relative atomic mass | 226.0254
Group | II.A
Electronegativity | 0.9
Oxidation numbers | 2
Electron configuration | 1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 5s2 5p6 4f14 5d10 6s2 6p6 7s2
Density [g/cm3] | 5.5
State | Solid
Melting point [°C] | 700
Boiling point [°C] | 1140
Thermal conductivity [W m-1K-1] | 18.6
Heat capacity [J K-1g-1] | 0.094
Discovery | 1898
Electrical conductivity [S m-1] | 106
1.st ionization energy [eV] | 5.2789
2.nd ionization energy [eV] | 10.148
Stable isotopes | 0
Unstable isotopes | 16