In the series scandium to zinc the enthalpy of atomisation of zinc is the lowest why
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1) 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? Answer: Zinc (4d10 5s2) has completely filled d-orbital and has no unpaired electron to take part in the formation of metallic bonds.
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The extent of metallic bonding an element undergoes decides the enthalpy of atomization. nThe more extensive the metallic bonding of an element, the more will be its enthalpy of atomization. In all transition metals (except Zn, electronic configuration: 3d^10 4s^2), there are some unpaired electrons that account for their stronger metallic bonding. Due to the
Due to theabsence of these unpaired electrons, the inter-atomic electronic bonding is the weakest in Zn and as a result, it has the least enthalpy of atomization.
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