Oxidized to volatile OsO4 and distilled off from PGM chloride solution (OsO4 is extremely volatile and extremely toxic); the tetroxide is reduced with hydrogen back to metal.
Research Elements Os · atomic number 76 Transition metal · period 6, group 8 [Xe] 4f14 5d6 6s2 Shells: 2, 8, 18, 32, 14, 2 Valence electrons: 2 in the outer shell (6s2), and 6 in 5d6 Green dots are the outer shell's s and p electrons. Softer green dots are the d electrons of transition metals, and the d and f electrons of lanthanides and actinides: they often take part in bonding, but not always. Grey dots are the core. Ground-state configuration from the NIST Atomic Spectra Database (A. Kramida, Yu. Ralchenko, J. Reader and the NIST ASD Team). Abundance is the mole fraction of the element found as that isotope on Earth; digits in parentheses are the uncertainty in the last digits. Masses and abundances from NIST, Atomic Weights and Isotopic Compositions (J. S. Coursey, D. J. Schwab, J. J. Tsai and R. A. Dragoset, National Institute of Standards and Technology).Osmium
Electrons
How it's obtained
Natural isotopes
Isotope Relative atomic mass Abundance 184Os 183.9524885(14) 0.0002(1) 186Os 185.9538350(16) 0.0159(3) 187Os 186.9557474(16) 0.0196(2) 188Os 187.9558352(16) 0.1324(8) 189Os 188.9581442(17) 0.1615(5) 190Os 189.9584437(17) 0.2626(2) 192Os 191.9614770(29) 0.4078(19)