To** rank charge/distance combinations** *from lowest energy to highest energy,* we use:

$\overline{){\mathbf{lattice}}{\mathbf{}}{\mathbf{energy}}{\mathbf{=}}\frac{\left|\mathbf{cation}\mathbf{}\mathbf{charge}\mathbf{\times}\mathbf{anion}\mathbf{}\mathbf{charge}\right|}{\mathbf{distance}}}$

Rank the following charge/distance combinations *from lowest energy to highest energy*. Your answer should be a four letter "word" made up of the letters a, b, c and d. For example, if you think the order is a (lowest energy), then b, then c, then d (highest energy), you should enter the "word" abcd in the answer box. Note, the word has no spaces or commas.

a) A +2 charge and a -2 charge separated by 3 units of distance

b) A -3 charge and a -1 charge separated by 3 units of distance

c) A +1 charge and a +1 charge separated by 2 units of distance

d) A -1 charge and a +2 charge separated by 3 units of distance

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What scientific concept do you need to know in order to solve this problem?

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Based on our data, we think this problem is relevant for Professor Petrovich's class at NCSU.