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Found the invisible atom.
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discovered that mass is neither created nor destroyed in chemical reactions.
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He proposed atomic theory with spherical solid masses in motion.
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Found out the eletric charge of the electron.
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Dalton's theory was based on the premise that the atoms of different elements could be distinguished by differences in their weights.
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The gold foil experiment consisted of a series of tests in which a positively charged helium particle was shot at a very thin layer of gold foil.
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He discovered that the properties of elements were perodic functions of their atomic weights.
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is a vacuum tube containing an electron gun (a
source of electrons or electron emitter) -
The Quantum atomic model is the most recent model of the atomt's based on quantum mechanics.
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He described atoms as a ball of positive charge containting a number of electrons.
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The electron cloud model is an atom model wherein electrons are no longer depicted as particles moving around the nucleus in a fixed orbit.
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each atom was a sphere filled with a
positively charged fluid. The fluid was called the "pudding." -
the components of the atom had been discovered. The atom consisted of subatomic particles called protons and electrons
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chemical
engineering, and physics. -
an atom that had all of the protons and neutrons clustered
together in a nucleus at the center of the atom. -
Stated that the electron moved around in the nucleas in large orbits.
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Moseley developed the application of X-ray spectra to study atomic structure.
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He proposed the "Electron Cloud Theory,
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Rutherford deterimed that the nucleas of an atom is very dense and has a positive charge.
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Chadwick proved the existance of neutron and discovered a particle within the nucleas.
