Comparison of Cerium and Praseodymium

Attribute	Praseodymium ×	Cerium ×
Atomic mass (u)	140.90766	140.116
Standard state	Solid	Solid
Oxidation states	+3	+3 +4
Electron configuration	[Xe]6s²4f³	[Xe]6s²4f¹5d¹
Atomic radius (van der waals) (pm)	239	235
Electronegativity (pauling scale)	1.13	1.12
Electron affinity (eV)	-	0.5
Ionization energy (eV)	5.464	5.539
Boiling point (K)	3793	3697
Melting point (K)	1204	1071
Density (g/cm³)	6.77	6.77
Atomic number	59	58
Group name	Lanthanide	Lanthanide
Symbol	Pr	Ce
Discovered (year)	1885	1803