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https://dashboard.dublinschools.net/lessons/?id=8c6135921e1bf12e66e7ca5a3b5cf0cb&v=2

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After decades of experiments and theory's, scientists have have the most modern discoverment: the electron cloud. This theory stats that the electrons in an atom orbit the nucleus in a wave pattern and can never be pi-pointed to a single location.

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https://www.youtube.com/watch?v=5pZj0u_XMbc

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After firing multiple shots of positively charged "bullets" at a thin sheet of gold foil.

After this experiment Rutherford discovered the nucleus after one of "bullets" repealed from the foil.

His theory was that all the positively charge particles in the atom were at one spot and the negative particles were scattered around it.

An example of the gold foil model:

Link

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http://www.glogster.com/hildaguzman/rutherford-atomic-model/g-6lv30plf6tn0rd43c4ei4a0
Hannah Lawton

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https://en.wikipedia.org/wiki/Niels_Bohr
Gavin Quinlivan

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Electrons belong to a specific energy level

Electrons are located on a orbit

Each orbit is set at a specific distance from the nucleus

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http://www.biography.com/people/jj-thomson-40039
Gavin Quinlivan

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https://en.wikipedia.org/wiki/Aristotle
Gavin Quinlivan

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Since Aristotle was the more respected person at the time his theories were more accepted then Democritus.

Aristotle thought that everything was made of the 4 main elements: fire, air, earth, and water

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JJ Thomson was the discoverer of the electron

First to say the atom was divisible

First to reason that there are also protons, but he could not find them.

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https://the-history-of-the-atom.wikispaces.com/Democritus?responseToken=2039825a5a8d1994c4476196cff5ac8d
Gavin Quinlivan

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http://www.biography.com/people/john-dalton-9265201
Hannah Lawton

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His experiments lead to acceptance of atoms.

His theory were widely accepted and was the foundation of modern chemistry.

Dalton's theory

All elements are made from atoms.

Atoms are invisible and indestructible.

All elements are made from different atoms but each element has its own atom.

Atoms from two or more elements form compounds.

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Was the first to really think of matter and atoms

Given the technology of his time he could not test this.

Democritus had the right idea