According to Coulomb's law, the force of repulsion between the two positive ions each of charge q, separate by a distance d is given by F=‌
1
4πε0
‌
(q)(q)
d2
F=‌
q2
4πε0d2
q2=4πε0Fd2 q=√4πε0Fd2.........(i) Since, q= ne where, n= number of electrons missing from each ion e= magnitude of charge on electron ∴‌‌n=‌