Assertion: neutron | /r/HasAspect | binding energy of about 2 mev
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Source sentences:
text: Since a proton and an electron had a combined mass of 1.0078 u, this implied the neutron as a proton–electron composite had a binding energy of about 2 MeV, which sounded reasonable, although it was hard to understand how a particle with so little binding energy could be stable.