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Atoms are composed of three sub-atomic particles, protons, neutrons, and electrons. It should be noted that there are many other types of sub-atomic particles, including neutrinos, positrons, photons, mesons, etc. And even protons and neutrons are apparently composed of even more elementary particles called quarks. But for the purposes of doing chemistry, there are just 3 kinds that matter, the protons, neutrons, and electrons.

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15y ago

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