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QUESTION

# How to draw the lattice and crystal lattice structure of ionic compounds?

It is difficult to draw the lattice structures of without a computer.

It is more important that you be able to recognize the unit cells in the lattice structures.

The positive and negative ions are often in a cubic array. Here are two examples.

"CsCl", a simple cubic structure

The "Cl"^- ions are the blue atoms at the corners of the cube.

The "Cs"^+ ions are at the centre of the cube.

The unit cell extends through the whole crystal.

This animation shows the "CsCl" lattice, the "Cs" sublattice in blue, and the "Cl" sublattice in brown.

"NaCl", a face centred cube

The green "Cl"^- ions occupy each corner and the centre of each face of the cube.

In the picture below, the "Na"^+ ions also occupy a face-centred cubic unit cell.

These unit cells extend through the whole crystal.