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

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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The high enthalpies of atomization of transition elements is due to the participation of electrons (n-1) d-orbitals in addition to ns electrons in the interatomic metallic bonding. In case of zinc, no electrons from 3d-orbitals are involved in the formation of metallic bonds. On the other hand, in all other metals of 3d series electrons from d-orbitals are always involved in the formation of metallic bonds.
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