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(1909)

Performed an oil drop test to determine the unit charge of an electron. He did this by using the mass-charge ratio. He eventually found out that an electrons mass equals 9.11x10^28g
(notes)

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(1794) A French chemist

Proust stated the law of Definite Proportions. This law states the ratio of elements in a compound is always the same. He also believed that matter can be put together in certain ways or patterns.
http://historyoftheatomictheory.weebly.com/joseph-proust.html
-Frankie

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(1772-1794) A French nobleman and chemist

He established the Law Conservation of Mass. He also found that combustion and respiration are caused by chemical reactions where one reactant is oxygen.
https://www.chemheritage.org/historical-profile/antoine-laurent-lavoisier
-Frankie

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(1893)

He came up with the idea that atoms are made up of even smaller items.

Thomson's Model
1.) He studied the passage of an electric current
2.)The current then passed through gas and gave off particles that are negatively charged
3.)Thomson was surprised by this discovery because the atoms were originally uncharged and did not understand where the negative charges came from
4.)He concluded that the negative charges came from inside the particle
5.)He proposed the "plum pudding" model
cake=positive
raisins=electrons
(notes)

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(1803)

He performed experiments that lead to the acceptance of atoms. He came up with the idea that atoms cannot be broken.

Dalton's theory
-elements are composed of atoms
-atoms of certain elements are identical
-atoms can not be created nor destroyed
-compounds contain the same amount of elements
(notes)

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This is a theory that states atoms are a wave and particle . This theory caused a lot of arguments between scientists. Discovered that electrons do not move around an atom in a definite path. It is impossible to determine the exact location of an electron. Electrons are most likely found in a "cloud" and the location of electrons depends upon how much energy it has. Electrons with the lowest energy levels are found closer to the nucleus and electrons with higher energy levels are found farther away from the nucleus.
-Frankie

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Greek philosopher (400 B.C.)

Was a more respected and well known philosopher compared to Democritus so people favored his idea about matter being made up of four elements. Earth, fire, water, and wind. (notes)

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Greek philosopher (400 B.C.)

He was the first one to propose the idea that all matter was made up of small pieces called atomos. (notes)

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(1913) A Danish scientist

Bohr's believed that electrons orbit the nucleus like planets orbit around the sun. The energy levels are located at certain distances from the nucleus.
(notes)
-Frankie

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(1908) An English physicists

He experimented with a tiny positively charged particles and shooting them at a  thin sheet of gold foil. Most of the bullets passed through the foil but some of the bullets bounced back. This is when Rutherford realized that positively charged atoms repel positively charged atoms.
(notes)
-Frankie