Atom timeline

Connor Ogle

Ancient Greek Model

In 400 BC Democratus believed that you could cut an object in half but eventually you would get to a small particle that could not be divided 350 bc aristotle added that matter could come in four elements. Earth, fire, water, air.
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Dalton Model

In 1803 John Dalton theorized atoms with a tiny sphere, he stated that all matter were made of atoms, atoms cannot be divided, elements of the same kind were made of the same kind of atom and different combinations of different atoms.
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Thompson Model

Joseph Thompson proposed that atoms were spheres of positive electricity that had little pieces of negative electricity he called them electrons and called it the plum pudding model. it was a major discovery because he was the first to conclude that there are particles smaller than an atom.
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Rutherford Greek Model

In 1908 Ernest Rutherford performed an experiment where he shot tiny particles at a sheet of gold foil. Most of the particles pass through. That told him that an atom is mostly empty space.

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Bohr Model

In 1913 Niels Bohr created a model that consist of a central nucleus surrounded by tiny particles called electrons which are moving so far is that if we saw them in an atom it would look like a blur.

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Broglie and Schrodinger

In 1920 Broglie and Schrodinger believed that instead of electrons orbiting the nucleus like planets, they moved like clouds and behave like particles and waves at the same time that were so fast that they look like clouds.

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