Philosophically suggested matter is made of indestructible, indivisible atoms
Empty space does not exist. Supported earth, wind, fire, water theory
Developed first atomic theory. All matter is made of Atoms and all atoms are invisible and indestructible.
Discovered Staircase Sequence on periodic table.
Used cathade rays from excited or electrified materials that moved toward the positive side of the the magnet to prove that atamos have negative particles called electrons
Found the atom is not hollow and it contained a positive core known as the nucleus with positive charges called protons.
Stated electrons aren't spread out randomly. Instead they exist in energy levels
Discovered the Neutron. Provided stability to the nucleus by neutrons.