Attribute | Francium × | Radon × |
---|---|---|
Electron affinity (eV) | 0.47 | - |
Electronegativity (pauling scale) | 0.7 | - |
Atomic mass (u) | 223.01973 | 222.01758 |
Standard state | Solid | Gas |
Oxidation states |
|
|
Electron configuration | [Rn]7s¹ | [Xe]6s²4f¹⁴5d¹⁰6p⁶ |
Ionization energy (eV) | 3.9 | 10.745 |
Atomic radius (van der waals) (pm) | 348 | 220 |
Boiling point (K) | - | 211.45 |
Melting point (K) | 300 | 202 |
Density (g/cm³) | - | 0.00973 |
Atomic number | 87 | 86 |
Group name | Alkali metal | Noble gas |
Discovered (year) | 1939 | 1900 |
Symbol | Fr | Rn |