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1804
-states that all matter is composed of atoms, indivisible and indestructible building blocks
-different elements have atoms of differing size and mass
*This was the first complete attempt to describe all matter in terms of atoms and their properties*

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What else was happening around the world:

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What else was happening around the world:

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-In 1803, representatives of the United States and Napoleonic France conclude negotiations for the Louisiana Purchase, successfully doubling the size of the country.

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April 30, 1897
-JJ Thomson was the first person to use the electron in their diagram
-JJ Thomson
-JJ Thomson made the theory that protons are uniform spheres of positively charged matter in which negatively charged electrons are embedded.
-His model was called the plum pudding model
-By using a cathode ray tube(CRT) in three separate experiments, Thomson was able to discover the electron.

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1911
-Ernest Rutherford's model describes the atom as a tiny, dense, positively charged core called a nucleus
-All mass is believed to be concentrated around the nucleus.
-Electrons are also believed to be concentrated around the nucleus.
-His famous experiment, the golden foil experiment, was able to draw two very important conclusions: 1) most space in an atom is empty 2) all the mass in an atom is concentrated in an area, known as the nucleus

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What else was happening around the world:

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What else was happening around the world:

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-The global war known as World War I began, sparking a 4 year conflict between the greatest powers on Earth up to that point.

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1913
-Bohr’s theory states that atoms have a positively charged nucleus that is orbited by electrons that move in circles.

-These electrons move in specific, distinct orbital levels.

-Even though this theory was proven wrong, it has had a lasting effect on the understanding of atomic structure and quantum physics.

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1926

The current model of the atom is called the Quantum Mechanical Model or the Electron Cloud Model.

This model is based off both the Bohr model and Rutherford model

The electron is similar to those two, but instead states that the atomic nucleus is surrounded by probability “clouds” of electrons called orbital.

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The stock market crash of 1929