Comparison of Terbium and Curium

Attribute	Curium ×	Terbium ×
Electronegativity (pauling scale)	1.3	-
Atomic mass (u)	247.07035	158.92535
Standard state	Solid	Solid
Oxidation states	+3	+3
Electron configuration	[Rn]7s²5f⁷6d¹	[Xe]6s²4f⁹
Ionization energy (eV)	6.02	5.864
Atomic radius (van der waals) (pm)	245	221
Boiling point (K)	3400	3503
Melting point (K)	1618	1629
Density (g/cm³)	13.51	8.23
Atomic number	96	65
Group name	Actinide	Lanthanide
Discovered (year)	1944	1843
Symbol	Cm	Tb