大象传媒

Ionic lattice

Learn more on the properties of ionic compounds in this podcast.

A regular arrangement of ions

The in a solid are not randomly arranged. Instead, they have a regular, repeating arrangement called an . The lattice is formed because the ions attract each other and form a regular pattern with oppositely ions next to each other.

Sodium and chloride ions tightly packed in rows and columns.
Figure caption,
A two-dimensional model for the ionic lattice in sodium chloride

The lattice arrangement continues in three dimensions. This is why solid ionic can form crystals with regular shapes. A crystal contains very many ions, so the ionic lattice is a 鈥榞iant鈥 ionic lattice.

Ionic structure of sodium chloride forming a cubic lattice
Figure caption,
A three-dimensional model for the ionic lattice in sodium chloride

Ionic bonds

The ionic lattice is held together by . In three-dimensional models, ionic bonds are shown as straight lines between ions. This is only to keep things simple, because ionic bonds can act in any direction.

An explanation of ionic bonding