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The Bohr Model has a nucleus with protons and orbitals for the electrons to travel on.

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The Chadwick Model has a nucleus with protons and neutrons and orbitals for the electrons around it.

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1926 (Schrodinger Model by Erwin Schrodinger)

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1926 (Schrodinger Model by Erwin Schrodinger)

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The Schrodinger Model has a nucleus with protons and it has little dots around the nucleus representing where the electrons could go.

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James Chadwick discovered the neutron - a neutrally charged particle with the same mass as a proton in the nucleus. Chadwick performed the beryllium bombardment experiments which showed something with the same mass of a proton but no electrical charge - neutrons.

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Erwin Schrodinger discovered that the electron cloud is a set of probabilities where electrons may be. Schrodinger's most famous experiment is known as Schrodinger's cat. It changed our understanding of the atom because it applies quantum physics which shows us where electrons could be.

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1911 (Rutherford Planetary Model by Ernest Rutherford)

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1911 (Rutherford Planetary Model by Ernest Rutherford)

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The Rutherford Planetary Model had a nucleus made up of protons and electrons randomly spread out around the nucleus.

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Niels Bohr built on Rutherford's model of the atom by discovering that electrons have orbitals. Electrons travel around the nucleus by varying fixed energy levels. Bohr worked with nuclear fission to find the nucleus and show orbitals for electrons.

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The Dalton Model was just a sphere.

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Ernest Rutherford discovered that the mass of an atom was concentrated in the center - the nucleus. Positive charge was in the center - protons have weight. Electrons fly around outside the nucleus and have no weight. Rutherford is most known for the gold foil experiment which showed that an atom was mostly empty space with a small nucleus.

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J.J. Thompson discovered atoms have electrons - little negative charges - inside them. His most famous experiment is the Cathode ray experiment which resulted in him discovering electrons.

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John Dalton thought atoms couldn't be divided - wrong! He was right though in thinking that all atoms of the same element are alike and have the same mass. He did experiments with gases by combining them and comparing them, which resulted in him creating his atomic model.

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Ancient Greece and India came up with the idea of atoms. They thought when you smash something, it gets smaller but never disappears. They thought that there was a "smallest" piece. The word atom comes from the Greek word atomos meaning "uncuttable".

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1904 (Plum Pudding Model by J.J. Thompson)

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1904 (Plum Pudding Model by J.J. Thompson)

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The Plum Pudding Model has little negative charges (electrons) embedded in a sea of positive charge.