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400
Demoocritus 400BC
He Discovered it in the 4rth century B.C, He informed everyone that an atom cannot be cut and still have the same substances He used evidence gathered from his experience. He described it as very small with particles similar to each other. -
Dalton
An atom is a small thing, and there are different masses with diffrent properties. He used gathered evidence from experiments. Atoms made of tiny balls arranged in invividual patterns. -
Thomson
He discovered that atoms are "cuttable". He studied the rays that travel between charged metal plates in a vacuum tube. He described it as a negatively charged electrons were embedded in a positively charged sphere -
Heisenberg and Schrodinger
He looked at the smallest pieces that make up atoms. He took the research from others and looked into it even further. Atoms are made of neutrons and protons not protons and electrons. -
Rutherford
He declared nearly all the mass of an atom is concentrated in a tiny nuclues. Based on the results of experiments in which he bombarded sheets of gold with alpha particles. -
Bohr
Electrons could travel only in a certain set of orbits around the nucleus.He Information based off the evidence working with Rutherford. He described atoms as inadequate.
