Osmium

Definitions

1. A chemical element (symbol Os) with atomic number 76: a hard, brittle, heavy, bluish-white transition metal found as a trace element in alloys, mostly in platinum ores.
   countable, uncountable
2. A single atom of this element.
   countable

Equivalents

Examples

“Their latest catalyst includes some osmium.”

“This reaction substitutes a ruthenium for an osmium.”

CEFR level