Comparison of Terbium and Lutetium

Attribute	Lutetium ×	Terbium ×
Electronegativity (pauling scale)	1.27	-
Atomic mass (u)	174.9668	158.92535
Standard state	Solid	Solid
Oxidation states	+3	+3
Electron configuration	[Xe]6s²4f¹⁴5d¹	[Xe]6s²4f⁹
Ionization energy (eV)	5.426	5.864
Atomic radius (van der waals) (pm)	221	221
Boiling point (K)	3675	3503
Melting point (K)	1936	1629
Density (g/cm³)	9.84	8.23
Atomic number	71	65
Group name	Lanthanide	Lanthanide
Discovered (year)	1907	1843
Symbol	Lu	Tb