Attribute | Xenon × | Francium × |
---|---|---|
1↑Standard state | Gas | Solid |
Electron affinity (eV) | - | 0.47 |
Electron configuration | [Kr]5s²4d¹⁰5p⁶ | [Rn]7s¹ |
Atomic mass (u) | 131.29 | 223.01973 |
Electronegativity (pauling scale) | 2.6 | 0.7 |
Oxidation states |
|
|
Ionization energy (eV) | 12.13 | 3.9 |
Atomic radius (van der waals) (pm) | 216 | 348 |
Boiling point (K) | 165.03 | - |
Melting point (K) | 161.36 | 300 |
Density (g/cm³) | 0.005887 | - |
Atomic number | 54 | 87 |
Group name | Noble gas | Alkali metal |
Symbol | Xe | Fr |
Discovered (year) | 1898 | 1939 |