Assertion: neutron's mass | /r/HasProperty | 664 90
Facets:
Source sentences:
text: The mass of a proton is 1.007 276 47 amu and the mass of a neutron is 1.008 664 90.
text: The mass of a proton is 1.007 276 47 amu and the mass of a neutron is 1.008 664 90.