pattern shown here. Since I realize that it is difficult to pin point the actual unit cell from the lattice, let's cut some of the atoms from the end of the lattice in order to facilitate this. This ...

Remember that the lattice arrangement is giant - for example, a single grain of salt may contain 1.2 × 10 18 (1,200,000,000,000,000,000) ions. The lattice arrangement continues in three dimensions.