2. WORKSHEET #36

3.  Because some elements have different isotopes. This means the same atom has different numbers of neutrons.

4. Percentage of category Score Percentage (as decimal) x Score Tests 75%8060 Classwork 25%9022.5 Final Grade Add the last column to get answer 82.5

5. Percentage of isotope Mass number of isotope Percentage (as decimal) x Mass Hydrogen-1 99%1.99 Hydrogen-2 0.8%2.016 Hydrogen-3 0.2%3.006 Average Atomic Mass Add the last column to get answer 1.012

6. Iodine Average Atomic Mass = 126.86 Nitrogen Average Atomic Mass = 14.07 Cesium Average Atomic Mass = 132.85

7. In your body, there are 3 types of carbon. Carbon-12, carbon-13 and carbon-14. The most abundant is carbon-12 at 98%, carbon- 13 at 1%, and carbon-14 at 1%. What is the average atomic mass for carbon? 2 points for correct answer 3 points for work