Crossword Genius

Chemical element, atomic no 76 (6)

Ross

I believe the answer is:

osmium

(Other definitions for osmium that I've seen before include "The heaviest metal known" , "Heaviest substance known" , "Silvery-white metal, Os" , "Metallic element" , "Metal, the densest natural element (symbol Os)" .)

I've seen this clue in The Guardian.
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