History of the Atom Worksheet – Flashcards
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What is the name of Dalton's theory?
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Dalton's Atomic theory
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What are elements made up of?
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Atoms
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What is a compound?
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Two or more atoms combined chemically
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What did J.J. Thompson discover?
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The electron
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What is the charge of an electron?
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Negative
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How did J.J. Thompson discover the electron?
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By using a cathode ray
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What did J.J. Thompson's model represent?
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A plum pudding
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What did Ernst Rutherford do?
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The gold foil experiment
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What did Rutherford find out?
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That the nucleus was positively charged
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What did Bohr find out?
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Created the model of an atom
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What does Bohr's model consist of?
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Nucleus with protons, electrons, and neutrons
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Why does Bohr's model represent the solar system?
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The electrons orbit just like the planets
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How much does the first energy level hold in Bohr's model?
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2
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How much does the second energy level hold in Bohr's model?
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8
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How much does the third energy level hold in Bohr's model?
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18
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How much does the fourth energy level hold in Bohr's model?
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32
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What did Dalton Discover?
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All elements are made up of atoms
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T of F: atoms can be neither created nor destroyed
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T
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T or F: Atoms of different elements are different
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T
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T of F: atoms of different elements don't combine to form a compound
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F
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T or F: Elements are not composed of atoms
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F
