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Arrange Y b + 3 , C e + 3 , L a + 3 , P m + 3 ions in increasing order of their ionic radii

Options

  1. AC e + 3 < Y b + 3 < P m + 3 < L a + 3
  2. BY b + 3 < P m + 3 < L a + 3 < C e + 3
  3. CY b + 3 < P m + 3 < C e + 3 < L a + 3
  4. DP m + 3 < L a + 3 < C e + 3 < Y b + 3

Correct answer

C. Y b + 3 < P m + 3 < C e + 3 < L a + 3

Step-by-step solution

Due to Lanthanoid contraction their is greater decrease in ionic radii of elements in lanthanide series because of poor shielding of nuclear charge by 4f electrons, hence the order will be Y b + 3 < P m 3 + < C e + 3 < L a 3 +

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