Comparison of Bromine and Astatine

Attribute	Astatine ×	Bromine ×
Atomic mass (u)	209.98715	79.9
Standard state	Solid	Liquid
Oxidation states	-1 1 3 5 7	-1 +1 +5
Electron configuration	[Xe]6s²4f¹⁴5d¹⁰6p⁵	[Ar]4s²3d¹⁰4p⁵
Atomic radius (van der waals) (pm)	202	183
Electronegativity (pauling scale)	2.2	2.96
Electron affinity (eV)	2.8	3.365
Ionization energy (eV)	9.5	11.814
Boiling point (K)	-	331.95
Melting point (K)	575	265.95
Density (g/cm³)	7	3.11
Atomic number	85	35
Group name	Halogen	Halogen
Symbol	At	Br
Discovered (year)	1940	1826