Zinc (), Cadmium (), and Mercury () are structurally situated in the d-block but are formally excluded from being classified as true transition elements. What is the fundamental quantum mechanical rea

Question

Zinc ($Zn$), Cadmium ($Cd$), and Mercury ($Hg$) are structurally situated in the d-block but are formally excluded from being classified as true transition elements. What is the fundamental quantum mechanical reason for this exclusion?

Prashant Kotian · Accepted Answer

Correct answer: B. A true transition element must have incompletely filled -orbitals. Group 12 elements () have configurations in their ground state () and their most stable state (), lacking unpaired -electrons entirely.

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