Comparison of Berkelium and Lawrencium

Attribute	Lawrencium ×	Berkelium ×
Atomic mass (u)	266.12	247.07031
Standard state	Solid	Solid
Oxidation states	+3	+3 +4
Electron configuration	[Rn]7s²5f¹⁴6d¹	[Rn]7s²5f⁹
Atomic radius (van der waals) (pm)	-	244
Electronegativity (pauling scale)	1.3	1.3
Melting point (K)	1900	1323
Ionization energy (eV)	-	6.23
Density (g/cm³)	-	14
Atomic number	103	97
Symbol	Lr	Bk
Discovered (year)	1961	1949
Group name	Actinide	Actinide