Which of the following is not paramagnetic?

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(C) To determine if a species is paramagnetic,we check for the presence of unpaired electrons.$1$. $Be^-$ ($4 + 1 = 5$ electrons): $1s^2 2s^2 2p^1$ (U

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$Cl^-$

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(C) To determine if a species is paramagnetic,we check for the presence of unpaired electrons.$1$. $Be^-$ ($4 + 1 = 5$ electrons): $1s^2 2s^2 2p^1$ (Unpaired electron present,paramagnetic).$2$. $Ne^{2+}$ ($10 - 2 = 8$ electrons): $1s^2 2s^2 2p^4$ (Unpaired electrons present,paramagnetic).$3$. $Cl^-$ ($17 + 1 = 18$ electrons): $1s^2 2s^2 2p^6 3s^2 3p^6$ (All electrons are paired,diamagnetic).$4$. $As^+$ ($33 - 1 = 32$ electrons): The electronic configuration ends in $4p^2$,which has unpaired electrons (paramagnetic).Therefore,$Cl^-$ is not paramagnetic.

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