J. J. Thomson (dec 18, 1856 – aug 30, 1940)
Description:
1856-1940 AD in England-Discovered the electron, the first ever known subatomic particle.
-Found the first evidence that stable elements can exist as isotopes.
-Invented the mass spectrometer.
-Created the incorrect plum pudding model of the atom, with electrons in a pudding of positive atom
Added to timeline:
Date:
dec 18, 1856
aug 30, 1940
~ 83 years