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