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What is actinoid contraction? Why actino...

What is actinoid contraction? Why actinoid contraction is greater than lanthanoid contraction?

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The gradual decrease in the size of atoms of actinoids or `M^(3+)` ions across the actinoid series is called actinoid contraction.
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What is lanthanoid contraction ?

What are actinoids?

The lanthanoid contraction refers to :

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Give reason: Actinoid contraction is greater from element to element than lanthanoid contraction.

Give reason : a) Cerium (Ce) exhibits +4 oxidation state. b) Actinoid contraction is greater from element to element than lanthanoid contraction.