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NEETChemistryd and f Block Elements

What is the unique feature in the chemistry of the lanthanoids?

Options

  1. AThe lanthanoid contraction
  2. BThe regular decrease in atomic radii
  3. CThe perfect shielding of electrons
  4. DThe irregular decrease in atomic radii

Correct answer

A. The lanthanoid contraction

Step-by-step solution

The overall decrease in atomic and ionic radii from lanthanum to lutetium (the lanthanoid contraction) is a unique feature in the chemistry of the lanthanoids.

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