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