Comparison of Radon and Francium

Attribute	Francium ×	Radon ×
Electron affinity (eV)	0.47	-
Electronegativity (pauling scale)	0.7	-
Atomic mass (u)	223.01973	222.01758
Standard state	Solid	Gas
Oxidation states	+1	0
Electron configuration	[Rn]7s¹	[Xe]6s²4f¹⁴5d¹⁰6p⁶
Ionization energy (eV)	3.9	10.745
Atomic radius (van der waals) (pm)	348	220
Boiling point (K)	-	211.45
Melting point (K)	300	202
Density (g/cm³)	-	0.00973
Atomic number	87	86
Group name	Alkali metal	Noble gas
Discovered (year)	1939	1900
Symbol	Fr	Rn