Name: Osmium

Atomic Symbol and Mass Number: Os [76]

Electron Configuration: [Xe] 4f   5d   6s

Atomic Radii: 135 pm

Electron Affinity: 106.1 kJ mol‑1

Oxidation States:+8,+7,+6,+5,+4,+3,+2,+1, 0, -1, -2, -4

Electronegativity Value: 2.2

Elemental Group: Transition Metal

Uses and Properties:

• Osmium is lustrous, silvery metal, one of the so-called platinum group of metals.

• It is the densest metal known, although only by the narrowest margins.

• Osmium is unaffected by water and acids, but dissolves with molten alkalis.

• Osmium powder reacts slowly with the oxygen of the air and gives off detectible amounts of osmium tetroxide vapor.

• Osmium has only a few uses. It is used to produce very hard alloys for fountain pen tips, instrument pivots, needles and electrical contacts.

• It is also used in the chemical industry as a catalyst.

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Lewis Diagram: