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  1. Proton - Wikipedia

  2. What Is a Proton? Definition and Properties

  3. Proton | Definition, Mass, Charge, & Facts | Britannica

  4. 2.6: Protons, Neutrons, and Electrons in Atoms - Chemistry ...

  5. Proton: Definition, Characteristics, & Location with Example

  6. 4.4: Protons, Neutrons, and Electrons - Chemistry LibreTexts

  7. DOE Explains...Protons - Department of Energy