Comparison of Molybdenum and Iridium

Attribute	Iridium ×	Molybdenum ×
Atomic mass (u)	192.22	95.95
Standard state	Solid	Solid
Oxidation states	+3 +4	+6
Electron configuration	[Xe]6s²4f¹⁴5d⁷	[Kr]5s¹4d⁵
Atomic radius (van der waals) (pm)	202	209
Electronegativity (pauling scale)	2.2	2.16
Electron affinity (eV)	1.565	0.746
Ionization energy (eV)	9.1	7.092
Boiling point (K)	4701	4912
Melting point (K)	2719	2896
Density (g/cm³)	22.42	10.2
Atomic number	77	42
Group name	Transition metal	Transition metal
Discovered (year)	1803	1778
Symbol	Ir	Mo