Are there more than three subatomic particles in an atom?

Yes. Consider the simplest atom, Hydrogen. It contains. One electron; One proton, which consists of. Two up quarks; One down quark; Gluons binding the quarks together. Photons binding the electron and proton together [thanks for the reminder, Jay! read more

So there are more than three kinds of subatomic particles in the simplest atom. Larger and more complicated atoms are made of the same five building blocks (e, u, d, g, photon). There are also myriad types of “virtual” particles that come and go within a proton (or neutron) through quantum loop effects. read more

In the physical sciences, subatomic particles are particles much smaller than atoms. The two types of subatomic particles are: elementary particles, which according to current theories are not made of other particles; and composite particles. Particle physics and nuclear physics study these particles and how they interact. read more