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Zn, Cd and Hg are not true transition metals because they have
AOnly one electron in the ns orbital
BA full d10 shell in atom and common ions
CA half-filled d5 shell in their ions
DNo electrons in the d subshell
Answer & Solution
Correct answer: B. A full d10 shell in atom and common ions
A transition metal needs an incomplete d subshell, but group 12 keeps d10 in the ground state and in its usual +2 state.
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