Describe thomson and millikan contributions to atomic theory

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.

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