Comparison of Protactinium and Lawrencium

Attribute	Protactinium ×	Lawrencium ×
Atomic mass (u)	231.03588	266.12
Standard state	Solid	Solid
Oxidation states	+4 +5	+3
Electron configuration	[Rn]7s²5f²6d¹	[Rn]7s²5f¹⁴6d¹
Atomic radius (van der waals) (pm)	243	-
Electronegativity (pauling scale)	1.5	1.3
Melting point (K)	1845	1900
Ionization energy (eV)	5.89	-
Density (g/cm³)	15.37	-
Atomic number	91	103
Symbol	Pa	Lr
Discovered (year)	1913	1961
Group name	Actinide	Actinide