Element no. 77 (7)

I believe the answer is:

iridium

(Other definitions for iridium that I've seen before include "Heavy brittle metallic element of the platinum group" , "Colourful compounds come from this" , "Corrosion inhibitor" , "Metallic element resistant to corrosion, atomic no. 77" , "Silvery-white metallic element" .)

I've seen this clue in the Family Time.

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