If you take chemistry, you will learn about electrons. Electrons are the smallest of the particles that make up an atom, and they carry a negative charge.
The number of protons and electrons is equal in each atom. The hydrogen atom, for example, has just one electron and one proton. The uranium atom, on the other hand, has 92 protons, and therefore, 92 electrons. The atom's atomic number is the number of protons in the atom, which by default is also the number of electrons. An electron is so small that it cannot be seen with the naked eye, but neither can the atom itself.
n an elementary particle with negative charge
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an electron ejected from matter by ionizing radiation
electron that is not attached to an atom or ion or molecule but is free to move under the influence of an electric field
an electron that is emitted from an atom or molecule by an incident photon
an electron in the outer shell of an atom which can combine with other atoms to form molecules
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an elementary particle that participates in weak interactions; has a baryon number of 0