Assertion: atom's particle | /r/HasProperty | discovered
Facets:
Source sentences:
text: Therefore, they were not atoms, but a new particle, the first subatomic particle to be discovered, which he originally called corpuscles but were later renamed electrons, after particles postulated by George Johnstone Stoney in 1874.
text: Later, two larger particles were discovered.
text: Funnily enough, the first particle that was discovered was actually the smallest of the three – the electron.