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What is lanthanoid contraction? Mention ...

What is lanthanoid contraction? Mention the cause for it.

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The overall decrease in atomic and ionic radii from Lanthanum to Lutetium is known as Lanthanide Contraction. It causes radii of 3rd transition series to be very similar with those of the corresponding members of the second transition series.
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The lanthanoid contraction refers to :

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