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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 series, Sc to Zn, all elements have one or more unpaired electrons except zinc which has no unpaired electron, its outer electronic configuration being `3d^(10)4s^(2)`. Lower the number of unpaired electrons, lower is the metal-metal bonding. Hence, metal-metal bonding is weakest in zinc. Therefore, enthalpy of atomisation is lowest.
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