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Osmium is a chemical element with the atomic symbol Os. It is a silvery metal with the slightest color of blue. It has the highest density of all 118 elements. It's a precious metal and therefore is limited in applications due to its price.

  • Density: ~22.59 g/cc
  • Atomic Number: 76
  • Group: Transition Metals (D Block)
  • Discovery: 1803 by Smithson Tennant
  • Melting Point: ~3038 C, 5491.4 F, 3306.15 K
  • Boiling Point: ~5018 C, 9046.4 F, 5281.15 K
  • Electron Configuration: [Xe] 4f14 5d6 6s2
  • Valence Electrons: 2 major (s orbital), 6 minor (d orbital)


Osmium's high density makes it fit for many applications. However, because of its high price, it's used where little osmium is needed- sometimes in alloy called osmiridium.[needcitation]


  • The Periodic Table of Elements by Theodore Gray

Online References