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Atomic size of the same group elements of 3d and 4d-series are almost similar

First ionization energies of 5d-series elements are smaller than that of 3d and 4d series elements

Both are correct

Both are incorrect

answer is D.

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Detailed Solution

Atomic size of the same group elements of 3d and 4d-series are not similar and first ionization energies of 5d-series elements are grater than that of 3d and 4d series elements.

Hence both the given options are correct.

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