Atomic Properties
- Atomic Number
- 87
- Atomic Mass
- 223.0000 u
- Electron Configuration
- [Rn] 7s1
- Electronegativity
- 0.79
- Block
- s-block
- Group
- 1
- Period
- 7
Physical Properties
- Phase (STP)
- solid
- Melting Point
- 300.00 K
- Boiling Point
- 950.00 K
- Density
- 1.8700 g/cm³
About Francium
Most unstable naturally occurring element; extremely rare and radioactive.
Isotopes of Francium
Francium has 0 naturally occurring isotopes, plus 1 notable radioactive isotope.
| Isotope | Mass Number | Atomic Mass (u) | Abundance | Type |
|---|---|---|---|---|
| 223Fr | 223 | 223.019736 | — | Radioactive |
Data source: NIH PubChem (aggregated from IUPAC, NIST)