Radium (Ra) — Element 88: Properties & Data | Aladdin Scientific
Radium(Ra) — Element 88
Radium (Ra) is a alkaline earth metal with atomic number 88 and atomic mass 226.025. It has melting point 973 K (700 °C), boiling point 1413 K (1140 °C), density 5 g/cm³. It sits in group 2 and period 7 of the periodic table and was discovered in 1898.
Key facts
| Atomic mass | 226.0254 u |
|---|---|
| Electron configuration | [Rn]7s2 |
| Oxidation states | +2 |
| Electronegativity (Pauling) | 0.9 |
| Atomic radius (van der Waals) | 283 pm |
| Ionization energy | 5.279 eV |
| Melting point | 973 K |
| Boiling point | 1413 K |
| Density | 5 g/cm³ |
| Standard state | Solid |
| Year discovered | 1898 |
Frequently asked questions
What is the electron configuration of radium?
The ground-state electron configuration of radium is [Rn]7s2.
What group and period is radium in?
Radium (Ra) is in group 2 and period 7 of the periodic table, classified as a alkaline earth metal.
What is the melting point of radium?
Radium melts at 973 K (700 °C).
What is the standard state of radium?
Radium is a solid at standard temperature and pressure.
Related elements
About this data: property values compiled from IUPAC Standard Atomic Weights (2021), the NIST Atomic Spectra Database, and PubChem. Curated by the Aladdin Scientific technical team. Last reviewed: .