First Ionisation Energy of 5d series elements are higher th…

Chemistry D and F - Block Elements Mix Single Correct MCQ

Published on: August 13, 2026

First Ionisation Energy 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 weak shielding of the nucleus by 4ƒ-electrons in 5d series. 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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