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Fr
Francium
#87 · Alkali Metal
| Mass | 223.01973 u |
| Density | 1.87 g/cm³ |
| Melting | 300.0 K |
| Boiling | 950.0 K |
| Electronegativity | 0.7 |
| Ionization Energy | 380.0 kJ/mol |
| Atomic Radius | 260.0 pm |
| Block | s-block |
| State (RT) | Solid |
| Config | [Rn] 7s1 |