Comparison of Hafnium and Platinum

Attribute	Platinum ×	Hafnium ×
Standard state	Solid	Solid
Electron affinity (eV)	2.128	-
Electron configuration	[Xe]6s¹4f¹⁴5d⁹	[Xe]6s²4f¹⁴5d²
Atomic mass (u)	195.08	178.49
Electronegativity (pauling scale)	2.28	1.3
Oxidation states	+2 +4	+4
Ionization energy (eV)	9	6.825
Atomic radius (van der waals) (pm)	209	212
Boiling point (K)	4098	4876
Melting point (K)	2041.55	2506
Density (g/cm³)	21.46	13.3
Atomic number	78	72
Group name	Transition metal	Transition metal
Discovered (year)	1735	1923
Symbol	Pt	Hf