feb 1, 1859 - 1897 AD: In 1897, J.J Thompson demonstrated that atoms were made up of even smaller particles called electrons, which gave the atom a (-) charge through electric field experiments. His model of an atom was known as a raisin bun model and was an improvement of Dalton’s model, with added electrons.
Added to timeline:
Date:
feb 1, 1859
Now
~ 166 years ago