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How will you accout for the following ? ...

How will you accout for the following ?
(i) Actinoids exhibit more number of oxidation states than lanthanoids.
(ii) Atomic radii of second and third transition series elements are almost identical.

Text Solution

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(a) This is because energy differenoe in 5f, 6d and 7s orbitals of actinoids is smaller than 4f, 5d and 6s orbitals of lanthanoids.
(b) Due to lanthonoid contraction.
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