Not exactly. While ionic solids have a very regular, repeating arrangement of ions (which are atoms that have gained or lost electrons), they don't necessarily have a single atom at every lattice point. Here's why:

* Ionic compounds are made of cations and anions: An ionic compound consists of positively charged ions (cations) and negatively charged ions (anions).

* Alternating ions: To maintain electrical neutrality, these ions alternate in the crystal lattice. So, at a given lattice point, you might find a cation, while at the adjacent lattice point, you'll find an anion.

* Different sizes: Cations are typically smaller than anions. This difference in size can influence how they pack together in the lattice.

Example:

In NaCl (table salt), the lattice points are occupied by:

* Sodium ions (Na+)

* Chloride ions (Cl-)

They alternate to create a stable, repeating structure.

Key takeaway: While ionic solids have a precise, repeating arrangement, the lattice points themselves are occupied by different types of ions, not always a single atom.