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He stated the four elements which are fire, water, earth, and wind. His atomic theory was that all elements with atoms can't be divided. He thought that the atoms were smooth, hard balls that won't be broken into smaller pieces.
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In 430 B.C. he discovered how matter was formed into small pieces, but couldn't be broken into smaller pieces. He used "atomos" which means uncuttable. He did a experiment on a seashell and kept breaking until it was powder and tried to break the powder but couldn't break it and discovered the invisible blocking block of the atom.
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He develop the first useful theory and studied meteorogoly that water that is evaporated is an independent gas. he also developed hypothesis that the ssize of the particles must be different.
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He was the one who discovered the electrons which have a negative charge. he made a experiment which was called the Cathode Ray Tube Experiment. He later found it the cathode rays and it contain a negtive charge and was smaller than a atom.
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He was the who made the oil drop experiment in 1909. He laater found the charge of the droplets on the electric field of the electron.
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He made a experiment called the gold foil experiment which contain a gold foil. He discovered the nuclear model of the atom and the splitting of the atom.
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Bohr's model is the shape of the solar system with the sun in the middle. he also suggested that the electron sjumps with the energy levels.
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He was the founder of the neutrons which are in the nucelus along with the protons. He also use a differnt method for looking for particle raditation
