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I am comparing the ions BeS and BeO.

BeS...
d=229 pm
Force of attraction = -6.856x10^29 J/m

BeO...
d=199 pm
Force of attraction = -9.078x10^29 J/m

I used Coulumb's to find this. Can you explain this?... the reasoning why BeS has a greater attraction?

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No, I can't. I would think the reverse. S is larger, the ions are farther apart, the attraction would be less for BeS than for BeO by my reasoning.

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