Assertion: neutron | /r/HasProperty | electron
Facets:
Source sentences:
text: The question of whether the neutron was a composite particle of a proton and an electron persisted for a few years after its discovery.
text: The theoretical physicists Niels Bohr and Werner Heisenberg considered whether the neutron could be a fundamental nuclear particle like the proton and electron, rather than a proton–electron pair.