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PhysicsClassical Physics

Coulomb's Constant: Attraction Between Sodium and Chloride Ions

Calculate the attractive force between singly charged sodium and chloride ions separated by 2.82 × 10⁻¹⁰ m using Coulomb’s constant.

Question

Two neighboring ions in a salt crystal, one sodium ion and one chloride ion, are separated by 2.82×10−10 m2.82\times10^{-10}\,\mathrm{m}. Each ion is singly charged. Determine the attractive electric force between this pair of ions.

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Evidence boundary

This is the pairwise electrostatic force in the stated point-charge textbook model. The separation and single-charge magnitudes come from the problem. The calculation does not include all neighboring ions, short-range interactions, or a measured net force in a real crystal.