1.

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.

Answer»

Solution :(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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