Comparison of Praseodymium and Uranium

Attribute	Uranium ×	Praseodymium ×
Standard state	Solid	Solid
Electron configuration	[Rn]7s²5f³6d¹	[Xe]6s²4f³
Atomic mass (u)	238.0289	140.90766
Electronegativity (pauling scale)	1.38	1.13
Oxidation states	+3 +4 +5 +6	+3
Ionization energy (eV)	6.194	5.464
Atomic radius (van der waals) (pm)	240	239
Boiling point (K)	4404	3793
Melting point (K)	1408	1204
Density (g/cm³)	18.95	6.77
Atomic number	92	59
Group name	Actinide	Lanthanide
Discovered (year)	1789	1885
Symbol	U	Pr