Comparison of Xenon and Francium

Attribute	Francium ×	Xenon ×
Standard state	Solid	Gas
Electron affinity (eV)	0.47	-
Electron configuration	[Rn]7s¹	[Kr]5s²4d¹⁰5p⁶
Atomic mass (u)	223.01973	131.29
Electronegativity (pauling scale)	0.7	2.6
Oxidation states	+1	0
Ionization energy (eV)	3.9	12.13
Atomic radius (van der waals) (pm)	348	216
Boiling point (K)	-	165.03
Melting point (K)	300	161.36
Density (g/cm³)	-	0.005887
Atomic number	87	54
Group name	Alkali metal	Noble gas
Symbol	Fr	Xe
Discovered (year)	1939	1898