Assertion: charged lepton | /r/HasProperty | theorized in the mid-19th century
Facets:
value: by several scientists
type: OTHER
Source sentences:
text: The first charged lepton, the electron, was theorized in the mid-19th century by several scientists and was discovered in 1897 by J. J. Thomson.
text: The first charged lepton, the electron, was theorized in the mid-19th century by several scientists and was discovered in 1897 by J. J. Thomson.