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Fire
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Water
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created the first atomic model
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proposed his modern theory of the atom
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discovered x-rays while using cathode-ray tubes.
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he discovered the plum pudding model of the atom
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Nagaoka developed an early, incorrect "planetary model" of the atom.
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He discovered the existence of the atomic nucleus.
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Theorized that atoms have their positive charge concentrated in a very small nucleus.
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Presented a picture of an atomic structure.
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Moseley's law advanced atomic physics
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He developed a theisis of important findings.
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He generated a mathematical model for the distribution of electrons in an atom.
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He proved the existence of neutrons.