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Describes how the atom was discovered
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1865 Johann Josef Loschmidt measured the size of the molecules that make up air
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J. J. Thomson, through his work on cathode rays in 1897, discovered the electron, and concluded that they were a component of every atom
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Nucleus was discovered
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Electrons follow clearly defined orbits of specific energies
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Wavelike behavior of particles
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Mathematical model that atoms are wavelike
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Murray Gell-Mann and George Zweig in 1964 The quark model was introduced
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Top quark found at Fermilab
