Fundamental Particles:

* Neutron: A neutron is a subatomic particle found in the nucleus of atoms. It has no net electric charge.

Composite Particles:

* Atoms: Atoms are the basic building blocks of matter. While they contain charged particles (protons and electrons), they have an overall neutral charge due to the equal number of protons and electrons.

* Molecules: Molecules are formed by the chemical bonding of two or more atoms. Since atoms themselves are typically neutral, molecules are usually also neutral.

* Some Ions: While ions are atoms or molecules that have gained or lost electrons, some ions are neutral. For example, the ammonium ion (NH4+) is a positively charged ion, but when it combines with a negatively charged ion like chloride (Cl-), it forms the neutral compound ammonium chloride (NH4Cl).

Other:

* Neutralinos: These are hypothetical particles predicted by some supersymmetry theories. They are thought to be electrically neutral.

Let me know if you'd like to know more about any of these particles!