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460 BC- 370 BC
1st Atomic Theory. Pre-Socratic philosopher who formulated an atomic theory for the cosmos. -
Proposed a mechanical universe with small solid masses in motion.
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Proposed an "atomic theory" with spherical solid atoms based upon measureable properties of mass.
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Brownian Motion- Jittery motion of tiny observable particles
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Used the term "electrolysis" as splitting an atom with electricity
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Production of heat by volcanic electricity
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Discovered cathode rays
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Studied "canal rays" and found they were associated with the proton H+
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Creation of a theory of radioactivity
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Discovered that inert gases have a stable electron configuration
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Published the famous equation E=MC^2
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Made a device that detects alpha radiation particles.
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Measured the charge of the electron and the photoelectric effect
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Used alpha particles as atomic bullets.
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Wrote, "The atomic number of an element is equal to the number of protons in the nucleus."
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Discovered the existence of isotopes through the use of a mass spectrograph.
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Developed an explanation of atomic structure.
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Described atoms by means of formula connecyed to the frequencies of spectral lines.
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Built an early linear accelerator and bombarded lithium with protons to produce alpha particles.
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Introduced "wave mechanics" as a mathematical model of the atom.
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Proposed anti-particles
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Used alpha particles to discover a neutral atomic particle with a mass close to a proton.
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conducted experiments verifying that heavy elements capture neutrons and form unstable products which undergo fission.
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Suggested a change in the layout of the periodic table.
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Conducted the first controlled chain reaction releasing energy from the atoms nucleus,
