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In the series Sc(Z = 21) to Zn (Z = 30),...

In the series Sc(Z = 21) to Zn (Z = 30), the enthalpy of atomisation of zinc is the lowest, i.e., `126 kJ mol^(-1)`, why ?

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In the formation of metallic bonds, no eletrons from 3d-orbitals are involved in case of zinc, while in all other metals of the 3d series, electrons from the d-orbitals are always involved in the formation of metallic bonds.
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