Atomic Structure And Radioactivity

37 Questions | Total Attempts: 336

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Atomic Structure And Radioactivity

Review on the parts of the atom, atomic number, mass number and radioactivity.


Questions and Answers
  • 1. 
    This subatomic particle has a negative charge.
    • A. 

      Neutron

    • B. 

      Proton

    • C. 

      Electron

  • 2. 
    The total number of these determines the mass number.
    • A. 

      Protons and electrons

    • B. 

      Neutrons and electrons

    • C. 

      Neutrons and protons

  • 3. 
    This particle has a mass that is about 1800 times smaller than the other two.
    • A. 

      Electron

    • B. 

      Proton

    • C. 

      Neutron

  • 4. 
    Isotopes of the same element have different numbers of these particles.
    • A. 

      Protons

    • B. 

      Neutrons

    • C. 

      Electrons

  • 5. 
    The number of these particles determines the atomic number
    • A. 

      Protons

    • B. 

      Protons and neutrons

    • C. 

      Protons and electrons

    • D. 

      Neutrons

    • E. 

      Neutrons and electrons

  • 6. 
    Found in the nucleus
    • A. 

      Electrons and neutrons

    • B. 

      Protons, electrons and neutrons

    • C. 

      Protons and neutrons

    • D. 

      Electrons and protons

  • 7. 
    Has a positive charge
    • A. 

      Electrons

    • B. 

      Neutrons

    • C. 

      Protons

  • 8. 
    Has no charge
    • A. 

      Electrons

    • B. 

      Neutrons

    • C. 

      Protons

  • 9. 
    Has a mass of about 1 amu
    • A. 

      Protons

    • B. 

      Electrons

    • C. 

      Neutrons

    • D. 

      Protons and electrons

    • E. 

      Neutrons and electrons

    • F. 

      Protons and neutrons

  • 10. 
       The number 14 is the:
    • A. 

      Mass number

    • B. 

      Atomic number

    • C. 

      Average atomic mass

  • 11. 
    The 28.09 is the:
    • A. 

      Atomic number

    • B. 

      Mass number

    • C. 

      Average atomic mass

  • 12. 
    You will need a periodic table for this one:A neutral atom of Pb-208 would have ? protons.
    • A. 

      82

    • B. 

      208

    • C. 

      126

  • 13. 
    A neutral atom of Pb-208 would have ? neutrons.
    • A. 

      208

    • B. 

      82

    • C. 

      126

  • 14. 
    A neutral atom of Pb-208 would have ? electrons.
    • A. 

      208

    • B. 

      82

    • C. 

      126

  • 15. 
    Chlorine has two naturally occurring isotopes, Cl-35 with a relative abundance of 75.77% and Cl-37 with a relative abundance of 24.23%.  On a piece of paper, work out the average atomic mass of chlorine rounded to the nearest 1/100th of an amu. Check out the explanation if you get it wrong!
  • 16. 
    Radium-211 has a half-life of 13 seconds.  If you started with 600 mg of Ra-211, how many seconds would it take until you only had 18.75 mg?
  • 17. 
    The half-life of Radium-229 is 4 minutes.  What was the original mass (to the nearest 1/100th of a gram) of Ra-229 if .32 g remains after 12 minutes?
  • 18. 
    Radium-226 has a half-life of 1600 years.  What percentage would be left (to the nearest 1/100th of a percent) after 6400 years?  Put a percent sign on your answer!
  • 19. 
    In beta decay, a neutron undergoes a change into a ? and then an electron is ejected from the nucleus.
  • 20. 
    In both fission and fusion, a small amount of ? is converted into energy.
  • 21. 
    In nuclear fusion, atoms of hydrogen are combined under intense heat and pressure to form ?
  • 22. 
    In nuclear fission, a ? strikes an atom of uranium (or plutonium) causing it to split.
  • 23. 
    Isotopes of the same element have the same mass number but different atomic numbers.
    • A. 

      True

    • B. 

      False

  • 24. 
    Over 99% of the mass of an atom is located within the tiny nucleus.
    • A. 

      True

    • B. 

      False

  • 25. 
    Most of an atom's volume is empty space.
    • A. 

      True

    • B. 

      False

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