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JEE Main2012Chemistryd and f Block ElementsActual

Magnetic moment of Gd ³⁺ ion ( Z =64) is

Options

  1. A3.62 BM
  2. B9.72 BM
  3. C7.9 BM
  4. D10.60 BM

Correct answer

C. 7.9 BM

Step-by-step solution

Gd (64)=[ Xe ] 4 f^7 5 d^1 6 s^2 Gd ³⁺=[ Xe ] 4 f^7 5 d^0 6 s^0 i.e. no. of unpaired electrons =7 aligned & = n(n+2) = 7(7+2) & = 63 =7.93 BM aligned

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