List the following gas-phase ion pairs in order of the...

List the following gas-phase ion pairs in order of the quantity of energy released when they form from separated gas-phase ions. List the pair that releases the least energy first. $\mathrm{Na}^{+} \mathrm{F}^{-}, \mathrm{Mg}^{2+} \mathrm{F}^{-}$ $\mathrm{Na}^{+} \mathrm{O}^{2-}, \mathrm{Mg}^{2+} \mathrm{O}^{2-}, \mathrm{Al}^{3+} \mathrm{O}^{2-}$ .

List the following gas-phase ion pairs in order of the quantity of energy released when they form from separated gas-phase ions. List the pair that releases the least energy first. $\mathrm{Na}^{+} \mathrm{F}^{-}, \mathrm{Mg}^{2+} \mathrm{F}^{-}$
$\mathrm{Na}^{+} \mathrm{O}^{2-}, \mathrm{Mg}^{2+} \mathrm{O}^{2-}, \mathrm{Al}^{3+} \mathrm{O}^{2-}$ .

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Key Concepts

Coulomb's Law

This law describes the force between two charges, indicating that the energy of interaction is proportional to the product of the charges divided by the distance between them. It is fundamental for understanding how energy is released when oppositely charged ions form and is crucial in predicting trends in the energy of gas-phase ion pair formation.

Ionic Charge Effects

The magnitude of the ions' charges plays a significant role in the energy released upon forming an ion pair. Higher charges result in a stronger electrostatic attraction, thus releasing more energy. This concept explains why ions with greater charges tend to generate more exothermic interactions.

Ionic Radii and Interionic Distance

The size of the ions, which determines the distance between them when they pair, also affects the strength of the interaction. Smaller ions can approach each other more closely, resulting in a stronger attractive force according to Coulomb’s law, and thereby releasing more energy when they form a bond.

Gas-phase Ion Pair Formation

In the gas phase, ions interact without stabilization from solvent molecules, making the direct electrostatic interactions the primary factor for energy release. This concept is essential for understanding trends in the energy associated with forming different gas-phase ion pairs.

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