Among the following which is not paramagnetic?

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

1 Answer
Doc048
Nov 18, 2017

#Cl^-# is Diamagnetic ... That is, all orbitals have paired electrons.

Explanation:

#Ne^o:[He]2s^(2)2p_x^2p_y^2p_z^2# => #Ne^+:[He]2s^(2)2p_x^2p_y^2p_z^1# + #e^-# (#2p_z# orbital is paramagnetic)

#Be^o:[He]2s^2# => #Be^+[He]2s^1# + #e^-# (#2s# orbital is paramagnetic).

#Cl^(o): [He]2s^(2)2p_x^2p_y^2p_z^1# + #e^-# => #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).

#As ^o:[Ar]4s^"2"3d^"10"4p_x^1p_y^1p_z^1# =>

#As ^+:[Ar]4s^"2"3d^"10"4p_x^1p_y^1p_z^1# + #e^-# (all 4p orbitals are paramagnetic).

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