Electric Charge and Atomic Structure Quiz
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Questions and Answers

What did E. Goldstein discover in 1886?

  • The indivisibility of the atom
  • The identification of electrons
  • The existence of sub-atomic particles
  • The presence of canal rays in a gas discharge (correct)

    • What is the charge of a proton represented as?

  • Minus one (-1)
  • Plus one (+1) (correct)
  • It varies
  • Zero (0)

    • What is the mass of an electron considered to be?

  • Unknown
  • Equal to that of a proton
  • Negligible (correct)
  • Heavier than a proton

    • Where were the protons believed to be located within the atom?

    <p>In the interior of the atom</p> Signup and view all the answers

    What did Rutherford conclude from the α-particle scattering experiment?

    <p>A very small fraction of α-particles were deflected by 1800, indicating that all the positive charge and mass of the gold atom were concentrated in a very small volume within the atom.</p> Signup and view all the answers

    What did Rutherford calculate about the radius of the nucleus based on his experiment?

    <p>The radius of the nucleus is about 105 times less than the radius of the atom.</p> Signup and view all the answers

    What is a drawback of Rutherford’s model of the atom?

    <p>Any particle in a circular orbit would undergo acceleration, causing it to lose energy and fall into the nucleus.</p> Signup and view all the answers

    What feature did Rutherford's nuclear model propose?

    <p>There is a positively charged centre in an atom called the nucleus. Nearly all the mass of an atom resides in the nucleus.</p> Signup and view all the answers

    What is the mass number defined as?

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

    How is the atomic number denoted?

    <p>By the letter 'Z'</p> Signup and view all the answers

    If the number of protons in an atom is 6, what is its atomic number?

    <p>6</p> Signup and view all the answers

    What determines the atomic number of an atom?

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

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