Assertion: free proton | /r/HasProperty | stable particle
Facets:
Source sentences:
text: The free proton (a proton not bound to nucleons or electrons) is a stable particle that has not been observed to break down spontaneously to other particles.
text: The free proton is stable.
text: The free proton (a proton not bound to nucleons or electrons) is a stable particle that has not been observed to break down spontaneously to other particles.