_____ He discovered the nucleus with his gold foil experiment

Experimenting with these gas-filled tubes helped Thomson and Crookes discover the electron

This theory held that negatively-charged electrons were suspended in positively-charged goo or dough

He was the first person to suggest matter was made of atoms, but couldn’t prove it so no one believed him

Most ancient Greeks thought all matter was made of these 4 things.

Almost 2,000 years later, he confirmed that matter really is made of atoms

This more famous Greek philosopher claimed atoms were not real and most people at the time believed him

His major contribution was discovering the electron and suggesting atoms looked like “plum pudding” or chocolate chip cookies

This experiment led to the discovery of the nucleus