Discovered the electron in 1897; Developed the "Plum Pudding Model"
Discovered the proton in 1910; Did the alpha scatter experiment.
Discovered the neutron in 1932
Symbol for electron
Symbol for proton
Symbol for neutron
Developed the law of conservation of mass
Developed the law of multiple proportions
Developed the law of definite proportions
Neutrons added to protons
Equals the number of protons or electrons