* Crystals are solid materials where the atoms or molecules are arranged in a highly ordered, repeating pattern. Salt (sodium chloride) forms a cubic crystal structure.

* Atoms are the basic building blocks of matter, but they don't form the geometric shape on their own.

* Elements are pure substances made up of only one type of atom. While salt is made of the elements sodium and chlorine, the elements themselves don't form the geometric shape.

* Electrons are negatively charged particles that orbit the nucleus of an atom. They don't directly contribute to the geometric shape of a crystal.

In summary: The geometric shape of salt comes from the organized arrangement of its ions (sodium and chloride) within a crystal lattice.