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Isotopes Practice Quiz

5 Questions
Isotopes Practice Quiz

A 5-question practice quiz for the topic on Isotopes at www. Thechemwhiz. Piczo. Com Note: you'll need a calculator.

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Questions and Answers
  • 1. 
    In an isotope, which part of the atom changes?
    • A. 

      Protons

    • B. 

      Neutrons

    • C. 

      Electrons

  • 2. 
    How does it change?
    • A. 

      They're not there anymore.

    • B. 

      They move to a different place.

    • C. 

      There are different numbers of them.

  • 3. 
    Calculator time!  19.9% of all Boron atoms are Boron-10. 80.1% are Boron-11. Calculate the approximated relative atomic mass of Boron, to one decimal place.
  • 4. 
    Magnesium has three of it's own isotopes.  78.7% is Magnesium-24. 10.13% is Magnesium-25. 11.17% is Magnesium-26. Calculate the relative atomic mass of Magnesium, to two decimal places.
  • 5. 
    Element occurs naturally in the environment. Scientists have found 612 atoms of A-15, 829 atoms of A-16, and 244 atoms of A-17. Calculate the relative atomic mass of the element to two decimal places.