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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.
polyatomic ion. a tightly bound group of atoms that behaves as a unit and carries a single charge. subscript. used in formulas to indicate the relative numbers of atoms of each type in the compound, but only if more than one atom of a given element is there.