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- Suggested that matter was made up of atoms, and that it will always exist
- Developed methods for gathering scientific facts; which other scientists used as an example/ guide for all scientific work
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- Beleived that if you kept cutting a substance in half, you would eventually reach an uncuttable part he called particles
- Suggested that atoms were hard & small particles that were put together into a particular shape, also thought that they were always moving and combine w/ each other
- stated that the universe is made up of empty space & an infinite number of particles
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- His experiments led to 1 of the fundamental laws of chemical behavior; law of conservation of matter; matter is conserved in a chemical reaction
- B/c of this we now understand why atoms are neither created or destroyed in a chemical reaction
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- Formed Atomic theory: states that all matter is made up of invisible particles called atoms; couldn't be destroyed
- Also said that even though atoms of an element are the same; different elements had different sized atoms and masses
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- Accidentally discovered that some atoms are radioactive
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- 1st person to discover the electron
- Developed pudding model of the atom, which desrcibes the atom as a positive sphere w/ small electrons inside
- Developed a method for spreading different kinds of atoms & molecules
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- Stated that radioactive materials cause atoms to break down spontaneously; which then releases radiation in the form of energy and polonium
- Discovered Radium and Polonium
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- Made the Quantum theory of energy ; proposed that energy is radiated in very small amounts instead of an unbroken continuous wave
- Einstein used his theory to describe the particle properties of light
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- Discovered the charge of an electron
- Specified the sir of the electron charge
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- Eplained natural radioactivity
- Determined the structure of the atom
- Changed 1 element into another by splitting its nucleus
- Discovered concept of radioactive half life
- Protons in core of atom
- Electrons surrounded core
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- Suggested electrons travel around the nucleus in definite paths; when they jump from one path to another, a light quantum is released
- Created Bohr model
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- Mentor was Rutherford
- Developed the application of x rays to study atomic structure
- Discoveries led to a more accurate placement of elements in the periodic table b/c of the closer determination of atomic #s
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- Quantum mechanical model of the atom (electron cloud)
- Used mathematical equations to describe the likelihood of finding an electro in a certain position
- Developed idea of sub energy levels
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- Used quantum mechanics to interpret the behavior of elementary particles & atoms ( position and velocity )
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- Discovered the neutron
- Inspired the US government to begin serious atomic bomb research efforts
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