Silvery-white metal, atomic no 48 (7)

I believe the answer is:

cadmium

(Other definitions for cadmium that I've seen before include "Silvery-white metal, Cd" , "Soft bluish-white metallic element" , "Metal resembling zinc" , "Toxic metal used in plating" , "Silvery-white metallic element" .)

I've seen this clue in The Guardian.

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