Two positive ions, each carrying a charge $q$, are separated by a distance $d$. If $F$ is the force of repulsion between the ions, the number of electrons missing from each ion will be ($e$ being the charge on an electron):

1. A
   $\frac{4\pi {ϵ}_{0}qFd}{e^2}$
2. B
   $\sqrt{\frac{4\pi {ϵ}_{0}F{d}^2}{e^2}}$
3. C
   $\frac{4\pi {ϵ}_0{d}^{2}F}{e^2}$
4. D
   $\sqrt{\frac{4\pi {ϵ}_{0}F{d}^2}{e^2}}$