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MHT CET202525 Apr 2025Evening ShiftChemistryd and f Block ElementsActual

Which element from following has smallest ionic size in +3 state?

Options

  1. ALu
  2. BLa
  3. CDy
  4. DNd

Correct answer

A. Lu

Step-by-step solution

The ionic size of lanthanide M ³⁺ ions decreases steadily across the lanthanide series due to lanthanide contraction . Of the given elements—lanthanum ( Z = 57 ), neodymium ( Z = 60 ), dysprosium ( Z = 66 ), and lutetium ( Z = 71 )—lutetium has the highest atomic number and thus the smallest ionic radius. Lu ³⁺ has the smallest ionic size. The final answer is A .

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