Comparison of Scandium and Nickel

Attribute	Nickel ×	Scandium ×
Atomic mass (u)	58.693	44.95591
Standard state	Solid	Solid
Oxidation states	+2 +3	+3
Electron configuration	[Ar]4s²3d⁸	[Ar]4s²3d¹
Atomic radius (van der waals) (pm)	163	211
Electronegativity (pauling scale)	1.91	1.36
Electron affinity (eV)	1.156	0.188
Ionization energy (eV)	7.64	6.561
Boiling point (K)	3186	3109
Melting point (K)	1728	1814
Density (g/cm³)	8.912	2.99
Atomic number	28	21
Group name	Transition metal	Transition metal
Discovered (year)	1751	1879
Symbol	Ni	Sc