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Matter is made up of individual invisible particles called atoms.
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In first centyry BC the egytians declined in power from their great empire to dramaticly spireling downward.
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Proposed atomic theory with spherical solid masses in motion.
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Studied the effect of electricity on solutions, coined term "electrolysis" as a splitting of molecules with electricity, developed laws of electrolysis.
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Described the atom as a ball of positive charged particles contaniting a number of electrons.
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Used the gold foil expiriment to discover that the nucleous is very dense and has a positive charge.
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Explained the atomic structure of the atom as succesive orbital shells of electrons
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Built an early linear accelerator and bombarded lithium with protons to produce alpha particles
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Discovered the nuetron
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Identified the eletron cloud model as the probable location of moving electrons.
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Conducted experiments verifying that heavy elements capture neutrons and form unstable products which undergo fission. This process ejects more neutrons continuing the fission chain reaction.
