# Question #8a58d

Common binary salts such as ${M}^{+} {X}^{-}$ are non-molecular substances, whose particles are held together by strong electrostatic forces. Each metal particle ${M}^{+}$ in a close-packed binary salt $M X$ is electrostatically attracted to 6 negatively charged ions ${X}^{-}$, and of course is attracted to every other negatively charged particle in the ionic lattice (of course the electrostatic force of attraction operates on an inverse square law).