Describe thomson and millikan contributions to atomic theory

Thompson discovered the electron and measuring of its charge to mass ratio. Millikan contributed the measurement of electrons charge.

Thomson's and Millikan's contributions to atomic theory:

Thomson is the first person, who suggest that the theory of the atom contains positive and negative particles and demonstrated the latter which are called "electrons".

Millikan: Millikan discovered that the weight of an electron is 1840 times smaller than a hydrogen atom that is having atomic mass 1.