Assertion: deuterium's electron | /r/HasProperty | excluded
Facets:
Source sentences:
text: The words isotope and nuclide both include the electron(s); to specify that electrons are excluded, one should use the word nucleus (or isotopic nucleus).
text: The former is 2.01410 u, the latter is 2.013553 u, the difference being whether the electron is included or not (0.511 MeV, etc.).