First IE of 5d series elements are higher than those of 3d …

Chemistry D and F - Block Elements General Single Correct MCQ

Published by: CGP EDU Academic Team

Published on: August 13, 2026

First IE of 5d series elements are higher than those of 3d and 4d series elements. This is due to :

Bigger size of atoms of 5d-series elements than 3d-series elements. and

Greater effective nuclear charge is experienced by valence electrons because of the both.

None of these.

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The order of shielding effect of various orbital electrons is s > p > d > f. Due to the poor shielding effect of 4f- electrons in 5d-series elements, there is enhanced increase in effective nuclear charge. As a result of this the valence electrons are tightly bound with the nucleus and thus their removal require higher energy.

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