Which of the following element has the highest first ionisation enthalpy?

Vanadium

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Zinc

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Copper

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Scandium

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Solution

The correct option is B Zinc
Ionisation enthalpy shows only a little variation on moving along the period of d-block elements. The first ionisation enthalpy of zinc, cadmium and mercury are higher than the other elements in their respective periods because of the fully filled $(n - 1) d^{10} n s^{2}$ configuration. Fully filled orbitals are more stable so removing an electron from them requires higher energy.
Hence, option (d) is correct.

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