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? 
(a) (b) (c)
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A performer who was popular on the vaudeville circuit, a series of variety entertainment shows in the late 19th and early 20th centuries.
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Agreements that restrict parties from engaging in similar agreements with others, often found in employment or distribution deals in various industries.
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The cost advantage that arises with increased output of a product, where the average cost per unit falls as production scales up.
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