Assertion: hydrogen atom's nucleus | /r/CapableOf | emit an alpha particle
Facets:
Source sentences:
text: Alpha decay: this process is caused when the nucleus emits an alpha particle, which is a helium nucleus consisting of two protons and two neutrons.
text: In this process, a thorium nucleus emits an α particle, leaving a radioactive daughter nucleus; this nucleus emits another α particle, again leaving a radioactive nucleus; and so on.