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Questions
How would you account for the following:
There is a greater range of oxidation states among the actinoids than among the lanthanides.
Account for the following:
Actinoids show more number of oxidation states than lanthanoids.
Solution
Actinides exhibit larger oxidation states than lanthanides, because of the very small energy gap between 5f, 6d and 7s subshells as compared to 4f, 5d and 6s orbitals in the case of lanthanoids. Thus, the outermost electrons get easily excited to the higher energy levels, giving variable oxidation states.
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