Assertion: atom's proton | /r/HasProperty | attracted to each other
Facets:
value: by gravitation
type: MANNER
value: by the nuclear force
type: CAUSE
Source sentences:
text: The protons and neutrons in the nucleus are attracted to each other by the nuclear force.
text: Two protons, for example, will repel each other because of their identical electrical force but will be attracted to each other by gravitation.