Assertion: atom's proton | /r/MadeOf | two upquarks
Facets:
Source sentences:
text: Protons contain two 'up' quarks and one 'down' quark while neutrons contain one 'up' quark and two 'down' quarks.
text: Protons contain two 'up' quarks and one 'down' quark while neutrons contain one 'up' quark and two 'down' quarks.
text: Research indicates that a proton contains two up quarks, each with a charge of 2/3+, and one down quark with a charge of 1/3−.