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Why are the ionisation energies of 5d el...

Why are the ionisation energies of 5d elements greater than 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 atomnictsizate of 5d element is small and its nuclear charge is large. Hence, the ionisation energies of 5d elements are larger than se 3d elements.
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MODERN PUBLICATION-D AND F-BLOCK ELEMENTS-CONCEPTUAL QUESTION
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  9. Name the following: (i) Divalent ion of first transition series h...

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  12. Name the transition element which does not exhibit variable oxidation ...

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