A student models the electrostatic force of attraction between isolated pairs of spherical ions using Coulomb's law, as represented in the diagrams below.

In Model X, a cation with charge \(+1\) and an anion with charge \(-1\) are separated by an internuclear distance of \(2d\). In Model Y, a cation with charge \(+2\) and an anion with charge \(-1\) are separated by an internuclear distance of \(d\).

Based on Coulomb's law, the magnitude of the attractive force between the ions in Model Y is how many times as great as that in Model X?