Comparison of Praseodymium and Plutonium

Attribute	Plutonium ×	Praseodymium ×
Standard state	Solid	Solid
Electron configuration	[Rn]7s²5f⁶	[Xe]6s²4f³
Atomic mass (u)	244.0642	140.90766
Electronegativity (pauling scale)	1.28	1.13
Oxidation states	+3 +4 +5 +6	+3
Ionization energy (eV)	6.06	5.464
Atomic radius (van der waals) (pm)	243	239
Boiling point (K)	3501	3793
Melting point (K)	913	1204
Density (g/cm³)	19.84	6.77
Atomic number	94	59
Group name	Actinide	Lanthanide
Discovered (year)	1940	1885
Symbol	Pu	Pr