Comparison of Astatine and Francium

Attribute	Astatine ×	Francium ×
Standard state	Solid	Solid
Electron configuration	[Xe]6s²4f¹⁴5d¹⁰6p⁵	[Rn]7s¹
Atomic mass (u)	209.98715	223.01973
Electronegativity (pauling scale)	2.2	0.7
Oxidation states	-1 1 3 5 7	+1
Ionization energy (eV)	9.5	3.9
Atomic radius (van der waals) (pm)	202	348
Melting point (K)	575	300
Electron affinity (eV)	2.8	0.47
Density (g/cm³)	7	-
Atomic number	85	87
Group name	Halogen	Alkali metal
Symbol	At	Fr
Discovered (year)	1940	1939