Chemistry / Chem 0205 · Atom · ~20 seconds
Proton
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A proton is a positively charged subatomic particle found in the nucleus, with a mass much greater than an electron's.
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Every hydrogen nucleus is a single proton, the "building block" Rutherford identified inside the nuclei of heavier elements as well.
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A proton's charge is fixed at one positive unit; only the number of protons present, never their individual charge, ever varies.