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Problem- I am working on ordering molecules from least to most exothermic (strength of ionic bonds). Please explain why NaI is less exothermic than LiBr.

I know that charge supercedes size but both these atoms seem pretty close in size. Tricks or tips on how to 'see' or better understand sizing ions would be appreciated. Maybe the professor didn;t explain it very well.

Solve the above problem and provide steps with explanation

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