What is the definition of a subatomic particle?

Answer 1

sub-atoms are protons neutrons and electron

Yesterday at night 7.00 pm I founded the sub-atomic law which clearly reveals the laws of sub-atoms

So i think you can add my sub-atomic law and make it as one theory called sub-atomic theory

Answer 2

Simply any particle smaller than an atom. There are a wide variety of subatomic particles.

An elementary particle is a particle not made up of other particles: examples include electrons, quarks, and "force carrier" particles such as Gluons or Photons.

A composite particle is a particle that is made up of other particles: examples include the Proton, which is made of two up quarks and one down quark.
Parts of atoms & particles smaller than atoms.

Answer 3

Any of various particles of matter that are smaller than a hydrogen atom

Answer 4

A subatomic particle is a particle smaller than an atom, such as protons, neutrons, and electrons. These particles are the building blocks of atoms and play a crucial role in the structure of matter.

Answer 5

It means smaller than an atom.