Atomic Properties
- Atomic Number
- 88
- Atomic Mass
- 226.0000 u
- Electron Configuration
- [Rn] 7s2
- Electronegativity
- 0.90
- Block
- s-block
- Group
- 2
- Period
- 7
Physical Properties
- Phase (STP)
- solid
- Melting Point
- 973.00 K
- Boiling Point
- 2010.00 K
- Density
- 5.5000 g/cm³
About Radium
Radioactive; discovered by Marie and Pierre Curie; glows blue.
Isotopes of Radium
Radium has 0 naturally occurring isotopes, plus 4 notable radioactive isotopes.
| Isotope | Mass Number | Atomic Mass (u) | Abundance | Type |
|---|---|---|---|---|
| 223Ra | 223 | 223.0185023 | — | Radioactive |
| 224Ra | 224 | 224.020212 | — | Radioactive |
| 226Ra | 226 | 226.0254103 | — | Radioactive |
| 228Ra | 228 | 228.0310707 | — | Radioactive |
Data source: NIH PubChem (aggregated from IUPAC, NIST)