Attribute | Xenon × | Astatine × |
---|---|---|
Standard state | Gas | Solid |
1↑Electron affinity (eV) | - | 2.8 |
Electron configuration | [Kr]5s²4d¹⁰5p⁶ | [Xe]6s²4f¹⁴5d¹⁰6p⁵ |
Atomic mass (u) | 131.29 | 209.98715 |
Electronegativity (pauling scale) | 2.6 | 2.2 |
Oxidation states |
|
|
Ionization energy (eV) | 12.13 | 9.5 |
Atomic radius (van der waals) (pm) | 216 | 202 |
Boiling point (K) | 165.03 | - |
Melting point (K) | 161.36 | 575 |
Density (g/cm³) | 0.005887 | 7 |
Atomic number | 54 | 85 |
Group name | Noble gas | Halogen |
Discovered (year) | 1898 | 1940 |
Symbol | Xe | At |