Attribute | Astatine × | Radon × |
---|---|---|
Standard state | Solid | Gas |
1↑Boiling point (K) | - | 211.45 |
Electron configuration | [Xe]6s²4f¹⁴5d¹⁰6p⁵ | [Xe]6s²4f¹⁴5d¹⁰6p⁶ |
Atomic mass (u) | 209.98715 | 222.01758 |
Electronegativity (pauling scale) | 2.2 | - |
Oxidation states |
|
|
Ionization energy (eV) | 9.5 | 10.745 |
Atomic radius (van der waals) (pm) | 202 | 220 |
Melting point (K) | 575 | 202 |
Electron affinity (eV) | 2.8 | - |
Density (g/cm³) | 7 | 0.00973 |
Atomic number | 85 | 86 |
Group name | Halogen | Noble gas |
Symbol | At | Rn |
Discovered (year) | 1940 | 1900 |