What was J J Thomson's biggest contribution?

Answer 1

Thomson discovered the electron in the year 1897.His work put forward a new theory, that atom was made up of small particles.Thus he discovered the electrons. He proved his theory using the cathode ray tube.

Answer 2

From Wikipedia:

Sir Joseph John "J.J." Thomson, OM, FRS (18 December 1856 - 30 August 1940) was a British physicist and Nobel laureate, credited for the discovery of the electron and of isotopes, and the invention of the mass spectrometer. He was awarded the 1906 Nobel Prize in Physics for the discovery of the electron and his work on the conduction of electricity in gases.

Answer 3

J.J. Thomson's biggest contribution to science was the discovery of the electron in 1897 through his experiments with cathode rays. This discovery led to the development of the plum pudding model of the atom and laid the foundation for modern atomic theory.

Answer 4

JJ Thompson discovered 'the electron in 1897 and he also discovered 'the proton'