| Property | Value |
|---|---|
| Atomic number | 88 |
| Atomic weight | 226.0254 amu |
| Element family | Alkali earth metals |
| Electronic configuration | 1s2 |
| Stable and very long lived isotopes | None |
| Previous element | Francium |
| Next element | Actinium |
| Density | 5.5 g/cm3 (STP) |
| Melting | 700 °C |
| Boiling | 1140 °C |
| Covalent radius | 2.01 Å |
| Van der Waals radius | 2.83 Å |
| Ionic radius | 1.43 Å |
| First ionization potential | 5.278 eV |
| Electron affinity | 0.100 eV |
| Electronegativity | 0.9 |
| Discovery year | 1898 |
| Sample reactions |
|---|
| Ra + C = RaC2 |
| Ra + Cl2 = RaCl2 |
| Ra + H2O = Ra(OH)2 + H2 |
Radium is an element number 88 from alkali earth metals family. Its symbol is Ra. Radium atomic weight is 226.0254 amu. Ra has no stable or long lived isotopes. Radium electronic configuration is 1s22s22p63s23p63d104s24p64d104f145s25p65d106s26p67s2. Sample compounds that contain Radium are Ra(OH)2, RaSO4.
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