Comparison of Osmium and Iridium

Attribute	Osmium ×	Iridium ×
Atomic mass (u)	190.2	192.22
Standard state	Solid	Solid
Oxidation states	+3 +4	+3 +4
Electron configuration	[Xe]6s²4f¹⁴5d⁶	[Xe]6s²4f¹⁴5d⁷
Atomic radius (van der waals) (pm)	216	202
Electronegativity (pauling scale)	2.2	2.2
Electron affinity (eV)	1.1	1.565
Ionization energy (eV)	8.7	9.1
Boiling point (K)	5285	4701
Melting point (K)	3306	2719
Density (g/cm³)	22.57	22.42
Atomic number	76	77
Group name	Transition metal	Transition metal
Discovered (year)	1803	1803
Symbol	Os	Ir