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What is lanthanoid contraction? Mention ...

What is lanthanoid contraction? Mention the cause for it.

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The gradual decrease in atomic radii or ionic radii from lanthanuus to lutitium is called lanthanoid contraction.
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The lanthanoid contraction refers to :

What is lanthanoid contraction? Write the general oxidation state of actinoids.

Give reason: (a) What is lanthanoid contraction? (b) Which is the general oxidation state shown by actinoids?

WHat is lanthanide contraction? Write any one consequence of lanthanid contraction.

What us lanthod contraction ? Write the general oxidation state of actinoids.