Subatomic particle
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![The Standard Model classification of particles](/Images/godic/202502/13/Standard_Model_of_Elementary_Particles.svg0144.png")
In the physical sciences, subatomic particles are particles much smaller than atoms. There are two types of subatomic particles: 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.