Among the following which is not paramagnetic?

Question

Among the following which is not paramagnetic?

(1) $N e^{2 +}$ $Ne^(2+)$
(2) $B e^{+}$ $Be^+$
(3) $C l^{-}$ $Cl^-$
(4) $A s^{+}$ $As^+$

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Answer 1 · 2017-11-18T02:05:14

$C l^{-}$ $Cl^-$ is Diamagnetic ... That is, all orbitals have paired electrons.

Explanation:

$N e^{o} : [H e] 2 s^{2} 2 p_{x}^{2} p_{y}^{2} p_{z}^{2}$ $Ne^o:[He]2s^(2)2p_x^2p_y^2p_z^2$ => $N e^{+} : [H e] 2 s^{2} 2 p_{x}^{2} p_{y}^{2} p_{z}^{1}$ $Ne^+:[He]2s^(2)2p_x^2p_y^2p_z^1$ + $e^{-}$ $e^-$ ( $2 p_{z}$ $2p_z$ orbital is paramagnetic)

$B e^{o} : [H e] 2 s^{2}$ $Be^o:[He]2s^2$ => $B e^{+} [H e] 2 s^{1}$ $Be^+[He]2s^1$ + $e^{-}$ $e^-$ ( $2 s$ $2s$ orbital is paramagnetic).

$C l^{o} : [H e] 2 s^{2} 2 p_{x}^{2} p_{y}^{2} p_{z}^{1}$ $Cl^(o): [He]2s^(2)2p_x^2p_y^2p_z^1$ + $e^{-}$ $e^-$ => $C l^{-} : [H e] 2 s^{2} 2 p_{x}^{2} p_{y}^{2} p_{z}^{2}$ $Cl^(-): [He]2s^(2)2p_x^2p_y^2p_z^2$ (All orbitals are filled (i.e., paired electrons) and therefore all diamagnetic (not paramagnetic).

$A s^{o} : [A r] 4 s^{2} 3 d^{10} 4 p_{x}^{1} p_{y}^{1} p_{z}^{1}$ $As ^o:[Ar]4s^"2"3d^"10"4p_x^1p_y^1p_z^1$ =>

$A s^{+} : [A r] 4 s^{2} 3 d^{10} 4 p_{x}^{1} p_{y}^{1} p_{z}^{1}$ $As ^+:[Ar]4s^"2"3d^"10"4p_x^1p_y^1p_z^1$ + $e^{-}$ $e^-$ (all 4p orbitals are paramagnetic).

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Among the following which is not paramagnetic?

(1) $N e^{2 +}$ $Ne^(2+)$
(2) $B e^{+}$ $Be^+$
(3) $C l^{-}$ $Cl^-$
(4) $A s^{+}$ $As^+$

1 Answer

Explanation:

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Among the following which is not paramagnetic?

(1) Ne2+Ne^(2+) (2) Be+Be^+ (3) Cl−Cl^- (4) As+As^+

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Explanation:

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(1) $N e^{2 +}$ $Ne^(2+)$
(2) $B e^{+}$ $Be^+$
(3) $C l^{-}$ $Cl^-$
(4) $A s^{+}$ $As^+$