Scientist's models and theories

6 amazing models and theories

Ancient Greek Model

Scientist: Democrates, and Aristotle

Year of discovery: 400b.c., & 350b.c.

In 400b.c. Democrates believed that you could cut an object in half and eventually you would get down to a small particle that could not be divided. In 350b.c. Aristotle added that matter would come in 4 elements, earth, air fire, and water.

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Dalton model

Scientist: Jon Dalton

Year of discovery:1803

He theorized that atoms are like tiny sphere's, and that all matter is made of atoms. Elements of the same kind were made of the same type of atom. Different elements were made of different atoms, and different combinations of different atoms.

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Thompson model

Scientist: Joseph Thompson

Year of discovery: 1897

In 1897 he proposed that atoms were spheres of positive electricity and had pieces of negative electricity floating around in it. He called these electrons and the entire model the "Plum Pudding" model. This was a big discovery because he was the first one to figure out that there was such thing smaller than an atom. This later led him to a Nobel Prize

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Rutherford model

Scientist: Ernest Rutherford

Year of discovery: 1908

Rutherford took a big leap in finding out what atoms look like today. Previous model only showed a box or sphere. In 1908 he did an experiment where he shot gold foil in to an atom, most of it went through telling him it was mostly empty space. He also discovered that there was a nuclear with a positive charge and electrons fly around it. Yet he had still not discovered protons and nuetrons.

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Bohr model

Scientist: Niels Bohr

Year of discovery: 1913

Bohr's model consists of the nuclear made of protons and nuetrons, and the electrons orbiting it. If we could see the electrons they would be a blur because of how fast they are moving. In excercises we do today we make it look like the electrons have one orbit but they actually change orbit every time.

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Broglie & Schrodinger model

Scientist: Broglie and Schrodinger

Year of discovery: 1920's

Broglie and Schrondiger developed the "electron cloud" model. They said that the Bohr model was incomplete. Instead they said the electrons in the electron cloud, around the nuclear. Their main idea was that the electrons behaved like particles and waves.

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