The d-And-f-Block Elements

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Transition metals usually form coloured ions, why?

Transition elelmet exhibit colour due to d-d transition. d-d transition is possible only when d- subshell have unpaired electron.Except few cases like Zn2+, Hg2+, Cd2+, Ti4+ etc., transition metal ions usually possess one or more unpaired d electrons which undergo d-d transition to impart colour to them.
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