Assertion: Zn, Cd and Hg cannot be regarded as transition elements. Reason: These elements do not belong to the d-block of the periodic table.

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If Assertion is CORRECT but Reason is INCORRECT. Explanation: Zn, Cd, and Hg are not regarded as transition elements because their atoms and common ions have a completely filled d-subshell (d10). However, the reason is incorrect because these elements do belong to the d‑block of the periodic table; they are excluded only because they do not have partially filled d‑orbitals.

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