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Has the theory that everything around him was made out of atoms.
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Proposes theory that that there is a mechanical universe with small solid masses moving.
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Proposed an 'Atomic Theory' with sphere-shaped soild atoms based on properties of mass.
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Studied the effect of electricity on solutions. Developed laws of electrolysis
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Arranged all the elements into 7 different groups with similar properties. He discovered that the properties of elements "were periodic functions of the their atomic weights". This became known as the Periodic Law.
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His theory was that electricity was made of negative particles he called 'electrons'.
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Used a CRT (Cathode Ray Tube) to experimentally determine the charge to mass ratio of an electron.
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He studied Canal Rays and found they were associated with the proton H.
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She studied Uranium and thorium and called their decay process 'radioactivity'. She and her husband also discovered the elements polonium and radium.
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He called the disintegration of radio elements into variants he called 'isotopes' or totally different elements. Also, discovered 'half-life'
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He studied the radiations from uranium and thorium and named them alpha and beta.
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Developed an explanation of atomic structure that talks about the regularities of the periodic table of elements. His atomic model had atoms built up of sucessive orbital shells of electrons.
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He used Alpha particles to discover a neutral atomic particle with a mass close to a proton. This was the neutron.