Question

Place the following salts in order of increasing lattice energy. NaCl, KBr, BeO I really need...

Place the following salts in order of increasing lattice energy. NaCl, KBr, BeO

I really need help with this. I know that ionic charge and size matters with lattice energy, but I am confused with comparing size. There are two ion in one molecule! which one should I compare?

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Answer #1

Lattice energy depends on:

Higher charge means higher lattice energy

Smaller size of ions means more lattice energy

In the same order of priority i.e charge over size

From this BeO has the highest lattice energy.

Now between NaCl and KBr, Na and Cl are smaller than K and Br meaning NaCl has more lattice energy

The order is : KBr < NaCl < BeO

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