Fr
Francium
Element 87 · Alkali metal · Period 7, Group 1
Solid · Discovered 1939
Atomic Properties
| Atomic Number | 87 |
| Atomic Mass | 223.01973u |
| Electron Configuration | [Rn]7s1 |
| Electronegativity | 0.7Pauling |
| Atomic Radius | 348pm |
| Ionization Energy | 3.9eV |
| Electron Affinity | 0.47eV |
| Oxidation States | +1 |
Physical Properties
| Standard State | Solid |
| Melting Point | 300K |
| Group Block | Alkali metal |
| Year Discovered | 1939 |