Which of the following pairs of ions are diamagnetic and exhibit a spin-only magnetic moment of zero? A. Sc ³⁺, Zn ²⁺ B. Ti ³⁺, Cu ⁺ C. V ⁵⁺, Cu ⁺ D. Cr ⁶⁺, Ni ²⁺ Choose the correct answer from the options given below:

Step-by-step solution

The spin-only magnetic moment is zero for diamagnetic ions, which have zero unpaired electrons. The electronic configurations of the given ions are: Sc ³⁺ : [ Ar ] 3 d ⁰ (0 unpaired electrons) Zn ²⁺ : [ Ar ] 3 d ¹⁰ (0 unpaired electrons) Ti ³⁺ : [ Ar ] 3 d ¹ (1 unpaired electron) Cu ⁺ : [ Ar ] 3 d ¹⁰ (0 unpaired electrons) V ⁵⁺ : [ Ar ] 3 d ⁰ (0 unpaired electrons) Cr ⁶⁺ : [ Ar ] 3 d ⁰ (0 unpaired electrons) Ni ²⁺ : [ Ar ] 3 d ⁸ (2 unpaired electrons) Pair A ( Sc ³⁺, Zn ²⁺ ) and Pair C ( V ⁵⁺, Cu ⁺ ) consist entire