# Problem: 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 distanceb) A -3 charge and a -1 charge separated by 3 units of distancec) A +1 charge and a +1 charge separated by 2 units of distanced) A -1 charge and a +2 charge separated by 3 units of distance

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###### Problem Details

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?

Our tutors have indicated that to solve this problem you will need to apply the Lattice Energy concept. You can view video lessons to learn Lattice Energy. Or if you need more Lattice Energy practice, you can also practice Lattice Energy practice problems.

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