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NEETChemistryd and f Block Elements

Which of the following lanthanoid ions exhibits the highest spin-only magnetic moment?

Options

  1. AGd ³⁺
  2. BEu ³⁺
  3. CCe ³⁺
  4. DLu ³⁺

Correct answer

A. Gd ³⁺

Step-by-step solution

The spin-only magnetic moment depends on the number of unpaired electrons ( n ), given by = n(n+2) BM. The ion with the maximum number of unpaired electrons will have the highest magnetic moment. The electronic configurations of the given ions are: Gd ³⁺ (Z = 64): [ Xe ] 4 f ⁷ ( n = 7 ) Eu ³⁺ (Z = 63): [ Xe ] 4 f ⁶ ( n = 6 ) Ce ³⁺ (Z = 58): [ Xe ] 4 f ¹ ( n = 1 ) Lu ³⁺ (Z = 71): [ Xe ] 4 f ¹⁴ ( n = 0 ) Since Gd ³⁺ has the maximum number of unpaired electrons ( n = 7 ), it exhibits the highest spin-only magnetic mom

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