COPY: Early History of Atomic Theory
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COPY: Early History of Atomic Theory

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Questions and Answers

Who proposed that atoms are solid indivisible spheres?

  • Leucippus
  • Aristotle
  • John Dalton (correct)
  • Ernest Rutherford

    • The Plum Pudding model was proposed by Joseph John Thomson.

    True

    What experiment did Robert Millikan conduct to determine the charge of electrons?

    Oil-drop Experiment

    H.G.J. Moseley studied _____ given off by various elements to establish atomic numbers.

    <p>X-rays</p> Signup and view all the answers

    Match the following scientists with their contributions to atomic theory:

    <p>Leucippus = Proposed the concept of indivisible atoms Humphry Davy = Studied the relationship of electricity and chemical reactions Eugen Goldstein = Discovered positively charged particles from canal rays Ernest Rutherford = Developed the nuclear model of the atom</p> Signup and view all the answers

    What does the atomic number of an element represent?

    <p>The number of protons in the nucleus</p> Signup and view all the answers

    Niels Bohr proposed that electrons can occupy an infinite number of energy levels.

    <p>False</p> Signup and view all the answers

    Who discovered neutrons?

    <p>J. Chadwick</p> Signup and view all the answers

    The principle that states it is impossible to determine the exact momentum and position of an electron simultaneously is known as the ______.

    <p>Heisenberg's Uncertainty Principle</p> Signup and view all the answers

    Match the following individuals to their contributions to atomic theory:

    <p>Niels Bohr = Planetary Model of the Atom Erwin Schrödinger = Wave Equation and Electron Cloud Model Louis de Brogli = Wave nature of Electrons J. Chadwick = Discovery of Neutrons</p> Signup and view all the answers

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