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Which group 12 triad is not regarded as transition metals by IUPAC?
AZn, Cd and Hg
BFe, Co and Ni
CCu, Ag and Au
DSc, Y and La
Answer & Solution
Correct answer: A. Zn, Cd and Hg
Zinc, cadmium and mercury have a full d10 shell in the atom and in common ions, so the IUPAC definition excludes them.
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