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A subatomic particle is a unit of matter or energy that's the fundamental makeup of all matter. According in modern atomic theory, an atom has a nucleus, which is its center, or core. The nucleus contains subatomic particles: protons and neutrons. Protons are positively-charged particles.
Answer Wiki. In ordinary matter, there are three subatomic particles: electrons, protons and neutrons. Electrons are indivisible; they are, as far as we know, dimensionless points having a [math]-1[/math] electrical charge. (I've expressed the charge in so-called natural units, where things like the