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Why are some of the transition metal ions colourless? |
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Answer» i. Transition metal ions exhibit colour due to the presence of unpaired electrons in (n-1)d-orbitals which undergo d-d transition. ii. The metal ions which do not have unpaired electrons i.e., (n-1)d0 or which have completely filled d-orbitals i.e., (n-1)d10 do not absorb radiations in visible region, since d-d transitions are not possible. Hence, they are colourless ions. eg. Cu+ (3d10), Ag+ (4d10), Zn2+ (3d10), Cd2+ (4d10), Hg2+ (5d10), etc. |
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