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? 
Definitions:
Postural Hypotension
A form of low blood pressure that occurs when standing up from sitting or lying down, causing dizziness or faintness.
Skin Breakdown
The deterioration of skin integrity, often due to prolonged pressure, friction, or moisture, leading to wounds or ulcers.
Positive Chvostek's Sign
An indication of neuromuscular excitability seen when tapping on the facial nerve elicits twitching of the facial muscles, often associated with hypocalcemia.
Compensated Heart Failure
A stage in heart failure where the body adapts and manages to maintain normal function despite the heart's reduced ability to pump blood.
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