Comparison of Rhodium and Platinum

Attribute	Platinum ×	Rhodium ×
Atomic mass (u)	195.08	102.9055
Standard state	Solid	Solid
Oxidation states	+2 +4	+3
Electron configuration	[Xe]6s¹4f¹⁴5d⁹	[Kr]5s¹4d⁸
Atomic radius (van der waals) (pm)	209	195
Electronegativity (pauling scale)	2.28	2.28
Electron affinity (eV)	2.128	1.137
Ionization energy (eV)	9	7.459
Boiling point (K)	4098	3968
Melting point (K)	2041.55	2237
Density (g/cm³)	21.46	12.4
Atomic number	78	45
Group name	Transition metal	Transition metal
Discovered (year)	1735	1803
Symbol	Pt	Rh