noun🔗ShareProtonenA positively charged subatomic particle forming part of the nucleus of an atom and determining the atomic number of an element, composed of two up quarks and a down quark."The number of protons in an atom's nucleus defines what element it is. "Die Anzahl der Protonen im Atomkern bestimmt, um welches Element es sich handelt.physicschemistryelementscienceenergysubstancestructuretechnicalcompoundChat with AIVocabulary GamePractice Reading