File:Quark_structure_proton.svg · Wikimedia Commons · See Wikimedia Commons
A proton is a tiny, positively charged particle that is one of the basic building blocks of atoms, found in the nucleus alongside neutrons. Protons matter because their number determines what chemical element an atom is, and they are essential to the structure and behavior of all matter.
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Discovered by embedding cosine similarity (sentence-transformers MiniLM, 384-dim).