Comparison of Cerium and Plutonium

Attribute	Plutonium ×	Cerium ×
Atomic mass (u)	244.0642	140.116
Standard state	Solid	Solid
Oxidation states	+3 +4 +5 +6	+3 +4
Electron configuration	[Rn]7s²5f⁶	[Xe]6s²4f¹5d¹
Atomic radius (van der waals) (pm)	243	235
Electronegativity (pauling scale)	1.28	1.12
Electron affinity (eV)	-	0.5
Ionization energy (eV)	6.06	5.539
Boiling point (K)	3501	3697
Melting point (K)	913	1071
Density (g/cm³)	19.84	6.77
Atomic number	94	58
Group name	Actinide	Lanthanide
Symbol	Pu	Ce
Discovered (year)	1940	1803