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John Dalton, a teacher, discovered that atoms made up different elements like water. All of these compound atoms are different sizes. This is important because this started the Periodic Table of the Elements.
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Thomson, a physicist, made a theory that the nucleus is positively charges with negatively charged electrons. This is important because it led to more research about the atom and proving Thomson wrong.
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Rutherford, a student of Thomson's, worked more on discovering atoms. After his gold foil experiment, he concluded that the atom was mostly empty space with his new discovery, the electron, and the nucleus in the center of the atom. This is important because this lead to the last theory that everyone believes by Bohr.
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Niels Bohr, another student of Thomson, added onto Rutherford's theory by making the electrons move around the atom in a specific orbit and can change between paths, but not in between the two paths. This is important because this is what people believe the atom is like.
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Erwin, a scientist, made a model of the atom where it was basically a mathematical model of distribution for the electrons in the model. This is important because it is one of the latest models and some people believe is right.
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James Chadwick experimented the atom by using beryllium atoms and alpha particles. This led to realizing that the atom had a particle that had neutral charge and mass. This was called the neutron. This is important because it is one of the most important parts of an atom.
