QuestionAugust 2, 2025

9.) Which of the following species are paramagnetic? Sc^3+,Br^-,Mg,As A. Sc^3+ B. Br^- C. Mg D. As

9.) Which of the following species are paramagnetic? Sc^3+,Br^-,Mg,As A. Sc^3+ B. Br^- C. Mg D. As
9.) Which of the following species are paramagnetic? Sc^3+,Br^-,Mg,As A. Sc^3+ B. Br^- C. Mg D. As

Solution
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Answer

D. As Explanation 1. Determine Electron Configuration Identify the electron configuration for each species: - Sc^{3+}: [Ar] (lost 3 electrons from Sc) - Br^{-}: [Kr] (gained 1 electron) - Mg: [Ne] 3s² - As: [Ar] 3d¹⁰ 4s² 4p³ 2. Identify Unpaired Electrons Check for unpaired electrons in each species: - Sc^{3+}: No unpaired electrons. - Br^{-}: No unpaired electrons. - Mg: No unpaired electrons. - As: 3 unpaired electrons in 4p orbitals. 3. Determine Paramagnetism A species is paramagnetic if it has unpaired electrons. Only As has unpaired electrons.

Explanation

1. Determine Electron Configuration<br /> Identify the electron configuration for each species:<br />- $Sc^{3+}$: [Ar] (lost 3 electrons from Sc)<br />- $Br^{-}$: [Kr] (gained 1 electron)<br />- $Mg$: [Ne] 3s²<br />- $As$: [Ar] 3d¹⁰ 4s² 4p³<br /><br />2. Identify Unpaired Electrons<br /> Check for unpaired electrons in each species:<br />- $Sc^{3+}$: No unpaired electrons.<br />- $Br^{-}$: No unpaired electrons.<br />- $Mg$: No unpaired electrons.<br />- $As$: 3 unpaired electrons in 4p orbitals.<br /><br />3. Determine Paramagnetism<br /> A species is paramagnetic if it has unpaired electrons. Only $As$ has unpaired electrons.
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