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Which of these species will have non-zero magnetic moment?

Options

  1. ANa ⁺
  2. BMg
  3. CF⁻
  4. DA r⁺

Correct answer

D. A r⁺

Step-by-step solution

Key point The species which has one or more unpaired electrons have non-zero magnetic moment. Electronic configuration of array l Na ⁺(Z=11)=1 s ² 2 s ² 2 p⁶ Mg (Z=12)=1 s ² 2 s ² 2 p⁶ 3 s ² F ⁻(Z=9)=1 s ² 2 s² 2 p⁶ Ar ⁺(Z=18)=1 s ² 2 s ² 2 p⁶ 3 s ² 3 p⁵ array As, Ar ⁺ has an unpaired electron, it has non-zero magnetic moment. Hence, (d) is the correct option.

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