Sinonimi: Os | atomic number 76
ETYM Greek osme a smell, odor.
Hard, heavy, bluish white, metallic element, symbol Os, atomic number 76, atomic weight 190.2. It is the densest of the elements, and is resistant to tarnish and corrosion. It occurs in platinum ores and as a free metal (see native metal) with iridium in a natural alloy called osmiridium, containing traces of platinum, ruthenium, and rhodium. Its uses include pen points and light-bulb filaments; like platinum, it is a useful catalyst.
It was discovered in 1803 and named in 1804 by English chemist Smithson Tennant (1761–1815) after the irritating smell of one of its oxides.
A hard brittle blue-gray or blue-black metallic element that is one of the platinum metals; the heaviest metal known; SYN. Os, atomic number 76.