---
title: "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?"
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url: "https://nerd-notes.com/ubq/119756/"
date_modified: "2026-08-21T08:12:13+00:00"
---

# 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?

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?

![A diagram with two stacked horizontal panels is shown. The top panel is labeled Model X and contains two circular particles aligned horizontally. The left circle is shaded light gray with a centered label +1. The right circle is open white with a black outline and a centered label -1. A double-headed horizontal dimension arrow connects the centers of the two circles and is labeled 2d. The bottom panel is labeled Model Y and contains two circular particles aligned horizontally. The left circle is shaded light gray with a centered label +2. The right circle is open white with a black outline and a centered label -1. A double-headed horizontal dimension arrow connects the centers of the two circles and is labeled d, drawn at half the length of the arrow in Model X. No other particles, labels, text, or annotations appear.](https://nerd-notes.com/wp-content/uploads/ubq-frq-generated/stem-fig-1-1787299933-QXupm1.jpg)

- **A.** \(2\)
- **B.** \(4\)
- **C.** \(8\)
- **D.** \(16\)

*The answer key and step-by-step explanation are available to logged-in users at https://nerd-notes.com/ubq/119756/*