Discussion
Atomic numbers of V, Cr, Fe and Zn are 23, 24, 26 and 30, respectively. Which one of the following materials does NOT show an electron spin resonance (ESR) spectra?
Answer: D
The material that shows no ESR spectrum is Zn.
Electron spin resonance needs unpaired electron spins. Zinc (Z = 30) has the configuration [Ar]3d104s2: completely filled shells, no unpaired electrons, and it is diamagnetic, so it gives no ESR signal.
V ([Ar]3d34s2), Cr ([Ar]3d54s1) and Fe ([Ar]3d64s2) all have partly filled 3d shells and unpaired electrons, the condition for a resonance absorption between spin states in a magnetic field.
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