99 \times 10^9 \, Nm^2/C^2$), $q_1$ and $q_2$ are the charges of the ions, and $r$ is the distance between them.
For a $\mathrm{K}^+$ ion, the charge is $q_1 = +e$, and for a $\mathrm{Cl}^-$ ion, the charge is $q_2 = -e$. The elementary charge $e$ is $1.60 \times
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