quarks and electrons are considered elementary particles, meaning they are not known to be composed of smaller particles. According to the currently accepted model in particle physics, called the Standard Model, quarks and electrons are fundamental, indivisible entities.
Quarks are believed to be the fundamental building blocks of hadrons, which include protons and neutrons. However, quarks themselves are not thought to be made up of smaller particles. They are characterized by their fractional electric charges and are bound together by the strong nuclear force to form composite particles.
Similarly, electrons are considered to be elementary particles with no known substructure. They are negatively charged and orbit around atomic nuclei, forming the basis of matter in our everyday lives. Electrons, along with two other charged particles called muons and taus, belong to a group of particles called leptons. Like quarks, leptons are believed to be fundamental and not composed of smaller constituents.
It's worth noting that the understanding of particle physics is continually evolving, and new discoveries or theoretical advancements could potentially provide new insights into the fundamental nature of particles. However, as of now, quarks and electrons are regarded as elementary particles without any evidence to suggest they are made up of smaller entities.