Electrons are short answer
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- An electron is a negatively charged subatomic particle. It can be either free (not attached to any atom), or bound to the nucleus of an atom. Electrons in atoms exist in spherical shells of various radii, representing energy levels. ... The charge on a single electron is considered as the unit electrical charge.
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An electron is a very small piece of matter and energy. Its symbol is e−. The electron is a subatomic particle. It is believed to be an elementary particle because it cannot be broken down into anything smaller.
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