(i) Why are Zn, Cd and Hg non-transition elements?
a. Atoms or ions do not have incomplete d subshell
b. Low metallic strength
c. Last electron enters in s subshell
d. Last electron enters in d subshell
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Zn, Cd, and Hg are not regarded as transition elements because their d-subshell is totally full-filled and thus they do not show much tendency to accept electrons in their 3d orbitals. So they are in their ground state as well as their most common oxidation state (+2).
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