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Q.
In the basic $CsCL$ crystal structure, $Cs^+$ and $Cl^-$ ions are arranged in a bcc configuration as shown in the figure. The net electrostatic force exerted by the eight $Cs^{+}$ ions on the $Cl^-$ ions is
The given crystal structure is a body centered cubic structure.
The electrostatic force.
$F=\frac{1}{4 \pi \varepsilon_{0}} \frac{q_{1} q_{2}}{r^{2}}$
due to one $Cs ^{+}$ion is balanced by diagonally opposite $Cs ^{+}$ion. Hence, net electrostatic force on $Cl ^{-}$ion due to eight $Cs ^{+}$ions is zero.
