Comparison of Titanium and Nickel

Attribute	Nickel ×	Titanium ×
Atomic mass (u)	58.693	47.867
Standard state	Solid	Solid
Oxidation states	+2 +3	+2 +3 +4
Electron configuration	[Ar]4s²3d⁸	[Ar]4s²3d²
Atomic radius (van der waals) (pm)	163	187
Electronegativity (pauling scale)	1.91	1.54
Electron affinity (eV)	1.156	0.079
Ionization energy (eV)	7.64	6.828
Boiling point (K)	3186	3560
Melting point (K)	1728	1941
Density (g/cm³)	8.912	4.5
Atomic number	28	22
Group name	Transition metal	Transition metal
Discovered (year)	1751	1791
Symbol	Ni	Ti