Atoms And The Nucleus

10 Questions

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Physics Quizzes & Trivia

Chemistr I H Unit III


Questions and Answers
  • 1. 
    Which of the following is NOT part of J.J. Thomson's model of an atom?
    • A. 

      His model is compared to plum pudding.

    • B. 

      The positive charge is localized in the center.

    • C. 

      An atom contains negative particles called electrons.

    • D. 

      An atom has its mass distributed nearly uniformly.

  • 2. 
    A charged particle that has a large mass is likely to
    • A. 

      Bend very little when passing between plates of different charge

    • B. 

      Bend a lot when passing between plates of different charge

    • C. 

      Pass between charged plates with no deflection

    • D. 

      Stop between charged plates

  • 3. 
    How is an atom changed into an ion?
    • A. 

      By losing or gaining electrons

    • B. 

      By losing or gaining neutrons

    • C. 

      By losing or gaining protons

    • D. 

      By ejecting beta particles from the nucleus

  • 4. 
    Which of the following is true of gamma radiation?
    • A. 

      It is positively charged.

    • B. 

      It is negatively charged.

    • C. 

      It can be blocked with a piece of paper.

    • D. 

      It is the most penetrating type of radioactivity.

  • 5. 
    What is the charge of the nucleus of an oxygen atom?
    • A. 

      6+

    • B. 

      16+

    • C. 

      24+

    • D. 

      8+

  • 6. 
    Which of the following is true of Ernest Rutherford's gold foil experiment?
    • A. 

      Very few of the positive particles were greatly deflected back.

    • B. 

      Most of the positive particles were greatly deflected back.

    • C. 

      Most of the positive particles were absorbed by the gold.

    • D. 

      Most of the positive particles dropped to the bottom of the gold foil.

  • 7. 
    Isotopes of the same element must have the same number of
    • A. 

      Protons

    • B. 

      Neutrons

    • C. 

      Electrons

    • D. 

      Total particles in the nucleus

  • 8. 
    A neutral atom with atomic number 12 and mass number 25 contains
    • A. 

      12 protons, 25 neutrons and 12 electrons

    • B. 

      12 protons, 13 neutrons and 12 electrons

    • C. 

      25 protons, 12 neutrons and 25 electrons

    • D. 

      13 protons, 12 neutrons and 12 electrons

  • 9. 
    The mass of a proton is
    • A. 

      Nearly the same as the mass of an electron

    • B. 

      Nearly the same as twice the mass of a neutron

    • C. 

      Nearly the same as the mass of a neutron

    • D. 

      Nearly the mass of an alpha particle

  • 10. 
    Atomic masses are assigned relative to
    • A. 

      Carbon-12 atoms

    • B. 

      Oxygen-16 atoms

    • C. 

      Calcium-40 atoms

    • D. 

      Hydrogen-1 atoms