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Bohr was also the first to discover that electrons orbit around the nucleus. These electrons are in an electron "cloud" or they just orbit nucleus.

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Was the first to figure out that electrons orbit around nucleus. Electrons are also in a specific energy levels. The exact location of an electron cannot be determined, only the probability can be set. The probability is based on what energy level the electron is at.

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Thomson found that there are negatively charged partials within the atom, he compares the atom structure to plum pudding. (Notes)
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Rutherford had his students shoot a alpha particle gun at a very thin gold sheet. After multiple trials of the particles passing through the sheet of gold, one strikes something that is positively charged, leading Rutherford and his students to find out that atoms have a nucleus and are manly empty space. (notes)

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Also known as the "Father of Atomic Theory", Dalton stated that all things are made of matter; whether that be of single atoms or compounds (Notes). Dalton also was the first to say that all atoms have a certain weight, and cannot be created or destroyed. (https://goo.gl/BzcK69).(https://goo.gl/SL4TNu).

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Atomic models have changed over time due to investigations and discoveries (Notes). https://goo.gl/c6foTZ

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Aristotle believed that all matter was made from earth, wind, fire, and air. (Notes). https://goo.gl/Tw9FMp

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In 492 BC Democritus the philosopher introduced the idea that all things are made up of small indestructible and dividable partials called atoms. Although he did not do any scientific experiments. https://goo.gl/5iyj4y Pic link

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Atmos: "To not be cut"
Atoms were first thought to be indivisible, and unable to be cut because they were the smallest form of matter. (Notes)