| Atomic Number: | 87 |
| Element Symbol: | Fr |
| Element Name: | Francium |
| Atomic Weight: | 223 |
| Group Number: | 1 |
| Group Name: | Alkali metal |
| Period Number: | 7 |
| Block: | s-block |
| Ground State Configuration: | [Rn] 7s |
| Ground State Level: | 2S1/2 |
| Standard State: | Solid |
| Common Valences: | 0,1 |
| First Ionization Energy: | 380 |
| Pauling Electronegativity: | 0.7 |
| Allred Rochow Electronegativity: | 0.86 |
| Mulliken Jaffe Electronegativity: | 0.68 |
| Enthalpy Of Fusion: | about 2 |
| Enthalpy Of Vaporization: | about 65 |
| Enthalpy Of Atmization: | about 64 |
| Most Common Oxidation Numbers: | 1 |
| Color: | Metallic |
| Classification: | Metallic |
| Discovered By: | Marguerite Perey |
| Discovered At: | France |
| Discovered When: | 1939 |
| Origin Of Name: | Named after France |
Calculate the molecular weight of Francium or molecular weight Fr.
Also see the full list of chemical elements and atomic weights.