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The first ionization enthalpy of 5d series elements are highest as compared to 3d and 4d elements because

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Weak shielding of nucleus by 5f-electrons

Weak shielding of nucleus by 4f-electrons

Strong shielding of nucleus by 5d electrons

Strong shielding of nucleus by 4d-electrons

answer is B.

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Detailed Solution

There is a strong pull on the valence electrons by the nucleus of 5d-transition metals because of the poor shielding of 4f electrons.

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