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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 enthalpy of atomization is directly linked with the stability of the crystal lattice and also the strength of the metallic bond. In case of zinc ( `3d^(10)4s^(2)` configuration ), no electrons from the 3d- orbitals are involved in the formation of metallic bonds since all the orbitals are filled. However, in all other elements belonging to 3d series one or more d-electrons are involved in the metallic bonds. This means that the metallic bonds are quite weak in zinc and it has therefore, lowest enthalpy of atomization in the 3d series.
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