Assertion: lepton's mass | /r/HasProperty | close to that of hydrogen
Facets:
value: very
type: DEGREE
Source sentences:
text: Because the reduced mass of muonium, and hence its Bohr radius, is very close to that of hydrogen, this short-lived "atom" (or bound muon-electron pair) behaves chemically – to a first approximation – like the isotopes of hydrogen (protium, deuterium and tritium).