Osmium (Os), chemical element, one of the platinum metals of Groups 8–10 (VIIIb), Periods 5 and 6, of the periodic table and the densest naturally occurring element.
Osmium.
atomic number76atomic weight190.2melting point3,000° C (5,432° F)boiling pointabout 5,000° C (9,032° F)specific gravity22.48 (20°
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