Attribute | Astatine × | Einsteinium × |
---|---|---|
1↑Standard state | Solid | Solid |
Electron configuration | [Xe]6s²4f¹⁴5d¹⁰6p⁵ | [Rn]7s²5f¹¹ |
Atomic mass (u) | 209.98715 | 252.083 |
Electronegativity (pauling scale) | 2.2 | 1.3 |
Oxidation states |
|
|
Ionization energy (eV) | 9.5 | 6.42 |
Atomic radius (van der waals) (pm) | 202 | 245 |
Melting point (K) | 575 | 1133 |
Electron affinity (eV) | 2.8 | - |
Density (g/cm³) | 7 | - |
Atomic number | 85 | 99 |
Group name | Halogen | Actinide |
Symbol | At | Es |
Discovered (year) | 1940 | 1952 |