Chemistry - GENERAL CHEMISTRY Question with Solution | TestHub

Spin-only magnetic moment depends only on the number of unpaired electrons: $\mu =\sqrt{n(n+2)}BM$.

Sc ([Ar] 3d¹4s²) and Cu ([Ar] 3d¹⁰4s¹) each have 1 unpaired electron, so their magnetic moments are the same.

Na and Rb each have an ns¹ configuration (1 unpaired electron), while Zn and Cd have d¹⁰s² configurations (0 unpaired electrons).

Cr has 6 unpaired electrons, whereas Cu has 1, so they do not have the same magnetic moment.

Answer: (B), (C) and (D)