Comparison of Astatine and Einsteinium

Attribute	Einsteinium ×	Astatine ×
Standard state	Solid	Solid
Electron configuration	[Rn]7s²5f¹¹	[Xe]6s²4f¹⁴5d¹⁰6p⁵
Atomic mass (u)	252.083	209.98715
Electronegativity (pauling scale)	1.3	2.2
Oxidation states	+3	-1 1 3 5 7
Ionization energy (eV)	6.42	9.5
Atomic radius (van der waals) (pm)	245	202
Melting point (K)	1133	575
Electron affinity (eV)	-	2.8
Density (g/cm³)	-	7
Atomic number	99	85
Group name	Actinide	Halogen
Symbol	Es	At
Discovered (year)	1952	1940