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CGP EDU Academic Team
Published on: August 13, 2026
Why are ionization energies of 5d-elements greater then those of 3d-elements ?
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In the 5d series, after lanthanum (Z = 57), there is lanthanide contraction. As a result, in each group the atomic size of 5d element is small and its nuclear charge is large. Hence the ionisation energies of 5d elements are large than 3d elements.
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