Assertion: proton's valence quark | /r/HasProperty | two up quarks of charge
Facets:
Source sentences:
text: Protons are composite particles composed of three valence quarks: two up quarks of charge +2/3e and one down quark of charge –1/3e.
text: Protons are composite particles composed of three valence quarks: two up quarks of charge + 2/3e and one down quark of charge − 1/3e.