I came across the statement “BeO and MgO have high melting point because of the lattice energy of BeO and MgO is appreciably high due to their small size” in my mAterial

I didn’t understand what has size got to do in determining lattice energy

  • $\begingroup$ In general, I would tend to agree with you. For ionic solids, where the interaction term is (hand waving a bit) purely an electrostatic one, if you bring a positive charge closer to a negative charge it will be deeper into the potential well (relative to infinity). So, some justification perhaps, but not on solid ground for the general case. $\endgroup$ – Jon Custer Apr 8 '19 at 22:31

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