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The d- and f-Block Elements
Spin-only Magnetic Moment of Transition Metal Ions
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Concepts tested
- Calculating unpaired electrons and spin-only magnetic moment
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2024 1 question
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'Spin only' magnetic moment is same for which of the following ions? A. $Ti^{3+}$ B. $Cr^{2+}$ C. $Mn^{2+}$ D. $Fe^{2+}$ E. $Sc^{3+}$ Choose the most appropriate answer from the options given below:Species with the same number of unpaired electrons have the same spin-only magnetic moment, $\mu = \sqrt{n(n+2)}$ BM. $Ti^{3+} = [Ar]\,3d^1$: 1 unpaired electron $Cr^{2+} = [Ar]\,3d^4$: 4 unpaired electrons $Mn^{2+} = [Ar]\,3d^5$: 5 unpaired electrons $Fe^{2+} = [Ar]\,3d^6$: 4 unpaired electrons $Sc^{3+} = [Ar]$: 0 unpaired electrons So $Cr^{2+}$ and $Fe^{2+}$ (B and D) have the same spin-only magnetic moment.