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Zn has lowest enthalpy of atomisation. Explain

Zn has fully filled configuration. It does not have any unpaired electrons due to which their intermolecular interactions are weak and thus the enthalpy of atomisation is less.

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This is because Zn has completely filled d orbital. Thus inter metallic bonding is weakest in zinc. More the unpaired electrons in d orbital stronger the inter metallic bonding.
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