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A 3d transition series element M exhibits only one oxidation state other than its elemental form. What is the spin-only magnetic moment of the stable cation of this element in aqueous solution?

Options

  1. A1.73 BM
  2. B2.83 BM
  3. C0 BM
  4. D3.87 BM

Correct answer

C. 0 BM

Step-by-step solution

The 3d transition series element that exhibits only one non-zero oxidation state is Scandium (Sc). It only shows a +3 oxidation state in its compounds. The electronic configuration of neutral Sc is [ Ar ] 3d^1 4s^2 . In its stable +3 oxidation state, the cation Sc ³⁺ has the configuration [ Ar ] 3d^0 4s^0 . Since there are no unpaired electrons ( n = 0 ), the spin-only magnetic moment is given by: = n(n+2) BM = 0 BM Answer: 0 BM

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