The atomic radii of a divalent cation and a monovalent anion are $0\mathrm{.}29$ nm and $0\mathrm{.}135$ nm$,$ respectively.

$($a$)$ Calculate the force of attraction between these two ions at their equilibrium interionic separation $($i$.$e$.,$ when the ions just touch one another$).$

Enter your answer for part $($a$)$ in accordance to the question statement

N

$($b$)$ What is the force of repulsion at this same separation distance? N