Apart from ion size, what determines coordination number in the unit cells of io

Question

Apart from ion size, what determines coordination number in the unit cells of ionic compounds?

Ionic bonding requires each ion to have a predetermined number of bonds each time it appears in a crystal. The octet rule determines the number of neighbors an atom can have. Intermolecular forces such as hydrogen bonding determine how particles are arranged in the crystalline solid. The electroneutrality principle requires each unit cell to have the same number of positive and negative charges, limiting the number of ions.

Explanation / Answer

The electroneutrality principle requires each unit cell to have the same number of positive and negative charges,limiting the number of ions.

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