Did Thomson invent the plum pudding model?

Yes, J.J. Thomson proposed the plum pudding model in 1904 after discovering the electron. This model depicted the atom as a sphere of positively charged matter with negatively charged electrons embedded within it, similar to raisins in a pudding. Although it was a significant step in atomic theory, subsequent discoveries, particularly the Rutherford gold foil experiment, showed that the structure of the atom is more complex than the plum pudding model suggested.