Assertion: ion's proton | /r/HasProperty | stable
Facets:
value: according to the standard model
type: OTHER
value: fundamentally
type: DEGREE
Source sentences:
text: Are protons fundamentally 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.
text: The spontaneous decay of free protons has never been observed, and protons are therefore considered stable particles according to the Standard Model.