The ionisation energies of transition element | vedclass

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(D) The ionisation energy of transition elements is higher than that of $s-$ block elements due to the smaller atomic size and higher effective nuclea

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Both $(a)$ and $(b)$

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(D) The ionisation energy of transition elements is higher than that of $s-$ block elements due to the smaller atomic size and higher effective nuclear charge.However,it is lower than that of $p-$ block elements because $p-$ block elements have higher effective nuclear charge and smaller atomic radii compared to transition elements.Therefore,the ionisation energies of transition elements are intermediate between $s-$ block and $p-$ block elements.Thus,the correct statement is that they are more than $s-$ block elements and less than $p-$ block elements.

The ionisation energies of transition elements are

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