Assertion: polonium's particle | /r/HasProperty | helium ions
Facets:
Source sentences:
text: It is radioactive because it emits alpha particles (helium ions).
text: It is radioactive because it emits alpha particles (helium ions).
text: It is radioactive because it emits alpha particles (helium ions).
text: It is radioactive because it emits alpha particles (helium ions).
text: It is radioactive because it emits alpha particles (helium ions).
text: It is radioactive because it emits alpha particles (helium ions).