Competency #5
Analyze atomic structure in terms of the Bohr model
Learning Objective d
- d. Describe how the average atomic mass (found on the periodic table for each element) is calculated
Question
Write down your answer to the following question:
Isotope Relative Abundance
Boron-10 20%
Boron-11 80%
Which of the following could be used to find the average atomic mass of boron?
- Average atomic mass = (10 + 11) / 2
- Average atomic mass = 11 (because it's the most common)
- Average atomic mass = (20*10 + 80*11) / 100
- The average atomic mass cannot be found from the information given
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