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JEE Main 201910 JanuaryMorning Shift
Exam
JEE Main
Year
2019
Date
10 January
Shift
Morning Shift
Subject
Chemistry
Chapter
d and f Block Elements

JEE Main 2019 · 10 January · Morning Shift · Chemistry · d and f Block Elements

The effect of lanthanoid contraction in the lanthanoid series of...

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 1414 electrons and protons increases the effective nuclear charge. Hence, both atomic and ionic radii decrease.
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