Comparison of Rhenium and Osmium

Attribute	Osmium ×	Rhenium ×
Atomic mass (u)	190.2	186.207
Standard state	Solid	Solid
Oxidation states	+3 +4	+4 +6 +7
Electron configuration	[Xe]6s²4f¹⁴5d⁶	[Xe]6s²4f¹⁴5d⁵
Atomic radius (van der waals) (pm)	216	217
Electronegativity (pauling scale)	2.2	1.9
Electron affinity (eV)	1.1	0.15
Ionization energy (eV)	8.7	7.88
Boiling point (K)	5285	5869
Melting point (K)	3306	3459
Density (g/cm³)	22.57	20.8
Atomic number	76	75
Group name	Transition metal	Transition metal
Discovered (year)	1803	1925
Symbol	Os	Re