| Property | Value |
|---|---|
| Atomic number | 87 |
| Atomic weight | 223.0197 amu |
| Element family | Alkali metals |
| Electronic configuration | 1s2 |
| Stable and very long lived isotopes | None |
| Previous element | Radon |
| Next element | Radium |
| Density | 1.87 g/cm3 (STP) |
| Melting | 27 °C |
| Boiling | 677 °C |
| Van der Waals radius | 3.48 Å |
| Ionic radius | 1.8 Å |
| First ionization potential | 3.938 eV |
| Electron affinity | 0.486 eV |
| Electronegativity | 0.79 |
| Discovery year | 1939 |
| Sample reactions |
|---|
| Fr + H2O = FrOH + H2 |
Francium is an element number 87 from alkali metals family. Its symbol is Fr. Francium atomic weight is 223.0197 amu. Fr has no stable or long lived isotopes. Francium electronic configuration is 1s22s22p63s23p63d104s24p64d104f145s25p65d106s26p67s1. Francium density is 1.87 g/cm3 (STP). Francium melting point is 27 °C. Francium boiling point is 677 °C. Francium van der waals radius is 3.48 Å. Francium ionic radius is 1.8 Å. Francium first ionization potential is 3.938 eV. Francium first ionization potential is 0.486 eV. Francium electronegativity by Pauling scale is 0.79. Francium was discovered in 1939.
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