He was the "creator" of the idea for the atom, He thought that atoms were little tiny quantities of mass and that everything in the world was made up of atoms.
Proposed that all atoms were indestructible and couldn't be broken. Only rearranged.
Created a plum pudding model of what he thought an atom was like. He later discovered the atomic nucleus which changed his perception of the atom entirely.
Created the well known "gold foil experiment" which was when he shot an atom gun at a sheet of gold foil and the atom bounced off instead of passing through. This changed the way we thought about atoms forever.
He discovered the wave nature of electrons and suggested that all matter have a certain wave property.
He used mathematical equations to find the exact position of the nucleus in an atom. This model is known as "The quantum mechanical model" of an atom.
Contributed to the atomic theory by including quantum mechanics, the branch of mechanics, based on quantum theory. This was important because he was able to reinvent the way we see the atom
Depicted the atom as a small, positively charged nucleus surrounded by electrons that that move circularly around the nucleus.