Osmium is element 76, a transition metal of the d block, in group 8, period 6. Its ground-state configuration is [Xe] 4f14 5d6 6s2, and it usually shows the oxidation states 0, 2, 3, 4, 6, 8.
It was discovered in 1803, by Tennant.
Name origin: the Greek osmè, meaning 'smell'.
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