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Last updated 5:16 PM on 3/4/25
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10 Terms

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John Dalton
Proposed the atomic model as tiny indivisible spheres in 1804.
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Plum Pudding Model
The atomic model proposed by JJ Thomson, depicting atoms as positively charged matter with negatively charged electrons embedded in it.
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Ernest Rutherford
Conducted the gold foil experiment, disproving the plum pudding model and proposing the nuclear model of the atom.
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Gold Foil Experiment
Rutherford's experiment that demonstrated that a nucleus exists at the center of the atom and that atoms are mostly empty space.
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Nucleus
The center of an atom, containing protons and neutrons, where most of the atom's mass is concentrated.
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Niels Bohr
Proposed that electrons orbit the nucleus in fixed energy levels or shells.
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Protons
Positively charged particles found in the nucleus of an atom.
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Neutrons
Neutral particles found in the nucleus of an atom, discovered by James Chadwick.
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Atom
The basic unit of a chemical element, made up of protons, neutrons, and electrons.
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Atomos
The Greek word meaning 'uncuttable,' from which the term 'atom' is derived.