Assertion: atom's proton | /r/PartOf | the nucleus
Facets:
Source sentences:
text: This hypothesized force was called the strong force, which was believed to be a fundamental force that acted on the protons and neutrons that make up the nucleus.
text: The protons and neutrons that make up the nucleus are approximately the same mass (the proton is slightly less) and have the same angular momentum, or spin.