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In the basic $\mathrm{CsCl}$ crystal structure, $\mathrm{Cs}^{+}$ and $\mathrm{Cl}^{-}$ions are arranged in a bcc configuration as shown in the figure. The net electrostatic force exerted by the eight $\mathrm{Cs}^{+}$ions on the $\mathrm{Cl}^{-}$ions is
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zero.
The electrostatic force due to one $\mathrm{Cs}^{+}$ion is balanced by diagonally opposite other $\mathrm{Cs}^{+}$. Thus the net electrostatic force on $\mathrm{Cl}^{-}$ion due to eight $\mathrm{Cs}^{+}$ ions is zero.
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