| Ra | Radium | Alkali Earth Metal |
| Atomic number: | 88 | Atomic weight: | (266.0254) | ||
| Shells: | 2,8,18,32,18,8,2 | Orbitals: | [Rn 7s2 | ||
| Melting point: | 700°C | Boiling point: | 1140°C | ||
| Covalent radius: | -- | Å | Atomic volume: | 45.20 | cm³/mol |
| Atomic radius: | -- | Å | Ionic radius: | 1.62 (+2) | Å |
| Electronegativity: | 0.9 | Oxidation states: | |||
| 1st ionization pot.: | 5.2789 | V | 2nd ionization pot.: | 10.148 | V |
| 3rd ionization pot.: | -- | V | Specific heat: | 0.12 | J/gK |
| Heat of fusion: | -- | kJ/mol | Heat of vapor.: | -- | kJ/mol |
| Thermal conduct.: | 0.186 | W/cmK | Electrical conduct.: | -- | 10^6/cm ohm |
| Density: | 5 | g/cm³ | Valence: | 2 |