Isotopes Practice Quiz

5 Questions  I  By Superoxideion01
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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1.  In an isotope, which part of the atom changes?
A.
B.
C.
2.  How does it change?
A.
B.
C.
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.
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