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Atomic radii and ionic radius of lanthanoid series increases from La to Lu due to?

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Lanthanoid contraction arises because \(4f\)-electrons shield the nuclear charge very poorly. This causes a steady decrease in atomic and ionic sizes across the lanthanoid series.
  • Lanthanoid contraction
  • Actinoid contraction
  • Intermolecular bonding
  • None
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The Correct Option is A

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