Comparison of Sodium and Cesium

Attribute	Sodium ×	Cesium ×
Atomic mass (u)	22.9897693	132.905452
Standard state	Solid	Solid
Oxidation states	+1	+1
Electron configuration	[Ne]3s¹	[Xe]6s¹
Atomic radius (van der waals) (pm)	227	343
Electronegativity (pauling scale)	0.93	0.79
Electron affinity (eV)	0.548	0.472
Ionization energy (eV)	5.139	3.894
Boiling point (K)	1156	944
Melting point (K)	370.95	301.59
Density (g/cm³)	0.97	1.93
Atomic number	11	55
Group name	Alkali metal	Alkali metal
Discovered (year)	1807	1860
Symbol	Na	Cs