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Idea: all things are made up of indivisible particles which he called “atomos”, from which the word atom derives from and that only void and atoms exist.
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Idea: Atomic theory. His theory states that, 1.All matter originates from atoms and they are indivisible and imperishable.
2.Atoms of a specific elements all share the same mass and properties.
3.Compounds are made from two or more different atoms.
4.A rearrangement of the atoms creates a chemical reaction. -
Idea: electricity was made of negative particles which he called “electrons”
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Thomson found the charge to mass ratio of an electron as 1.759 x 10 8 coulombs/gram.
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Planck’s radiation law: explains radiation emitted by blackbody using quanta.
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Created a “Saturnian” model with rings of electrons orbiting a positive particle.
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Experiment: Oil drop which determined the size of the electron.
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Through a experiment, Rutherford found the nucleus to be small, dense and positively charged and that the electrons are outside the nucleus.
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Moseley’s idea was that the atomic number of an element is the number of protons the element has.
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Suggested a model of the atom that had shells of electrons which orbited the atom.
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Proved the existence of neutrons, particles with no electrical charge