The diagram below shows three ion pairs: (a) a doubly charged anion and cation, (b) a singly charged anion and cation, and (c) two doubly charged anions.
(I) Label each pair to identify the electrostatic interaction as attractive or as repulsive.
(II) Which pair has the largest electrostatic interaction energy that is positive?
(III) Which pair has the largest electrostatic interaction energy that is negative?
(IV) Which pair has the smallest electrostatic interaction energy? 
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