Assertion: neutron | /r/HasProperty | a proton-electron composite
Facets:
Source sentences:
text: If the neutron's mass was less than the combined masses of a proton and an electron (1.0078 u), then the neutron could be a proton-electron composite because of the mass defect from the nuclear binding energy.
text: In particular, Heisenberg assumed the neutron was a proton–electron composite, for which there is no quantum mechanical explanation.