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Heat of atomization of zinc is lowest among 3d-series elements due to

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$(n - 1) d$ electrons involve in bonding

$(n - 1) d$ electrons donot involve in bonding

Larger size of zinc

Stronger metallic bond in zinc

answer is B.

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Detailed Solution

Due to the absence of unpaired electrons in ns and (n–1)d shells, the interatomic electronic bonding is the weakest in zinc.
Consequently, zinc has the least enthalpy of atomisation in the 3d series of transition elements.

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