Comparison of Cobalt and Lutetium

Attribute	Lutetium ×	Cobalt ×
Atomic mass (u)	174.9668	58.93319
Standard state	Solid	Solid
Oxidation states	+3	+2 +3
Electron configuration	[Xe]6s²4f¹⁴5d¹	[Ar]4s²3d⁷
Atomic radius (van der waals) (pm)	221	192
Electronegativity (pauling scale)	1.27	1.88
Electron affinity (eV)	-	0.661
Ionization energy (eV)	5.426	7.881
Boiling point (K)	3675	3200
Melting point (K)	1936	1768
Density (g/cm³)	9.84	8.86
Atomic number	71	27
Group name	Lanthanide	Transition metal
Symbol	Lu	Co
Discovered (year)	1907	1735