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How will you account for the following? ...

How will you account for the following?
(i) Actionoids exhibit more number of oxidation states than lanthanoides.
ii) Atomic fadii of second and third transition series elements are almost identical.

Text Solution

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(i) This is because energy difference in 5f, 6d and 7s orbitals of actionoids is smaller than 4f, 5d and 6s orbitals of lanthanoids.
(ii) Due to lanthanoid contraction.
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