He thought an atom was the smallest piece of matter. He named it an Atom, or uncuttable.
He thought atoms were indestructible pieces of matter. He also thought that all atoms have the same shape. He also thought that atoms can only be combined in whole numbers.
J.J Thomson used a cathode ray on an atom. Using this, he discovered that there are smaller parties surrounding. These particles are called Electrons
Earnest Ruthford fired a laser at a pice of gold foil. In doing so, the light reflected in multiple different directions. This caused the assumption that the electrons were scattered around the nucleus.
Niels Bohr's model shows that electrons orbit around a nucleus. They rotate in a pattern similar to that of planets around a star.
The modern diagram of the atom depicts that electrons fly randomly around the nucleus.