1- Plum Pudding Model

1) JJ Thomson, 1897 discovered the electron 2) Atoms consisted of a positively charged ball with negative electrons embedded inside 3) Evidence to prove this: - Solids cant be squashed ∴ the atoms which make them up must be solid throughout - Rubbing 2 solids together can cause static charge ∴ there must be something (electrons) on the outside of atoms transferred as atoms collide NOTE: Before this Greek philosopher Demokritos (460-370 BCE) thpought matter was made up of tiny uncuttable pieces - atoms