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JEE Main201910 Jan 2019Morning ShiftChemistryd and f Block ElementsActual

The effect of lanthanoid contraction in the lanthanoid series of elements by and large means

Options

  1. Aincrease in atomic radii and decrease in ionic radii,
  2. Bdecrease in atomic radii and increase in ionic radii.
  3. Cincrease in both atomic and ionic radii.
  4. Ddecrease in both atomic and ionic radii.

Correct answer

D. decrease in both atomic and ionic radii.

Step-by-step solution

In lanthanide series, the presence of additional 14 electrons and protons increases the effective nuclear charge. Hence, both atomic and ionic radii decrease.

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