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Give reason : Iron has higher enthalp...

Give reason :
Iron has higher enthalpy of atomisation that of copper.

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Iron being a transition element has unpaired electrons `(3d^(6)4s^(2))` and hence has a strong metallic bonding which is the reason of its higher enthalpy of atomisation. In contrast, Cu does not have any unpaired d - electron and hence has a weak metallic bonding.
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