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- Water is the primary form of matter

- Everything is made of matter

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- He was the first to propose Earth, Air, Fire, and Water as the primary elements of life

- Held together by moral forces: love and strife

- Earth. Air, Fire, and Water combine to make new substances

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- Father of Atoms

- Only two things exist in the universe: the atom and void

- Atoms are too small to be seen

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- Adopted atomic theory from his mentor, Leucippus.

- Atoms are solid and indestructible, but invisible

- Created first atomic model

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- Referred as the Father of Chemistry

- Did physical experiments to study gases and proposed that elements are made of corpuscles that organize different chemical substance groups.

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- Electrons can only occupy well-defined orbits to fixed energy levels

- Each shell can't accommodate than a certain level

- Electrons must exist in fixed arrangements

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- In 1927, the uncertainty principle can't know the exact location of electrons or how fast it is going

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- Discovered third atomic component, neutrons, in 1932

- Nucleus thought to have protons and neutrons

- Before 1932, atoms were thought to have a positively charged surrounding with negative electrons

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- Known as Father of Nuclear Physics

- Considered greatest experimentalist

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- Stated that all of matter is made of small particles called atoms

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- Determined that electrons made up an atom

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- Governed the arrangement and existence of electrons

- Said that a maximum of two electrons can occupy a specific energy level

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- Electron Cloud: The electrons were put set in wave patterns around nucleus

- Made an electron cloud model

- Wave Mechanics: Even though electrons are normal particles, they act as waves

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- Greek philosopher and scientist

- Spent life teaching, writing, and studying

- Classified animals based on their characteristics