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In the early 1800's John Dalton discovered that everything was made up of atoms. He didn't know about the properties of atoms or what they looked like. He thought it was a sphere.
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In 1897, JJ Thomson made his discovery of electrons. He did not yet know about nucleus's or neutrons. He believed the atom was a sphere full of electrons and a spherical cloud of positive charge.
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In 1909, Ernest Rutherford discovered the nucleus. This was a big discovery in furthering knowledge of the atom. He believed that the postively charged particles were in the nucleus, while the negatively charged particles were outside of the nucleus.
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In 1913, Niels Bohr made the discovery that electrons orbit the nucleus. Before this discovery scientists were not sure where the electrons were located or what they did.
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Louis de Brogile proposed that electrons moved in a wavy manner around the nucleus of the atom. This helped scientists further understand the atom.
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Werner Heisenberg discovered the behavior of electorns. This helped further understand electrons .
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Erwin Schrödinger helped discover the wave function where electrons don't go in a straight path but they go in a wave pattern.
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James Chadwick discovered that there wasn't just positive and negatively charged particles in atoms, and that their were neutral particles. They are called neutrons.
