Ra
Radium
Element 88 · Alkaline earth metal · Period 7, Group 2
Solid · Discovered 1898
Atomic Properties
| Atomic Number | 88 |
| Atomic Mass | 226.02541u |
| Electron Configuration | [Rn]7s2 |
| Electronegativity | 0.9Pauling |
| Atomic Radius | 283pm |
| Ionization Energy | 5.279eV |
| Oxidation States | +2 |
Physical Properties
| Standard State | Solid |
| Melting Point | 973K |
| Boiling Point | 1413K |
| Density | 5g/cm³ |
| Group Block | Alkaline earth metal |
| Year Discovered | 1898 |