Abstract
MATTER is made up of atoms, each consisting of a number of electrons moving round a central nucleus. It is likely that the nuclei are not simple particles, but are themselves made up of electrons, together with hydrogen nuclei, or protons as they are called, bound very strongly together. There would thus be only two kinds of simple particles out of which all matter is built, the electrons, each carrying a charge − e, and the protons, each carrying a charge + e.
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DIRAC, P. The Proton*. Nature 126, 605–606 (1930). https://doi.org/10.1038/126605a0
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DOI: https://doi.org/10.1038/126605a0
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