# 8.2     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?

The enthalpy of atomisation of zinc is lowest due to the absence of an unpaired electron, which is responsible for metallic bonding in the elements. Therefore, the inter-atomic bonding is weak in zinc($Zn$). Hence it has a low enthalpy of atomisation.

The enthalpy of atomisation of zinc is lowest due to the absence of unpaired electron,which ie responsible formetallic bonding in the elements.Therefore, the inter-atomic bonding is weak in zinc($Zn$). Hence it has low enthalpy of atomisation.

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