Here is the answer for the question – **Bromine, which has an atomic mass of 79.904 amu, has only two naturally occurring isotopes ( Br-79 and Br-81 ). The mass of Br-81 is 80.9163 amu, and its natural abundance is 49.31%.**. You’ll find the correct answer below

### Bromine, which has an atomic mass of 79.904 amu, has only two naturally occurring isotopes ( Br-79 and Br-81 ). The mass of Br-81 is 80.9163 amu, and its natural abundance is 49.31%.

What is the natural abundance of Br-79?

Express the percent abundance to four significant figures.

**The Correct Answer is**

**50.69 % The sum of percent abundances for all isotopes is equal to 100%, so the percent abundance of Br-79 (more commonly written as 79Br) is the difference between 100% and 49.31%. Now that you have the percent abundance of the other major isotope, you can use the atomic mass to calculate the mass of this isotope.**

### Reason Explained

50.69 % The sum of percent abundances for all isotopes is equal to 100%, so the percent abundance of Br-79 (more commonly written as 79Br) is the difference between 100% and 49.31%. Now that you have the percent abundance of the other major isotope, you can use the atomic mass to calculate the mass of this isotope. is correct for Bromine, which has an atomic mass of 79.904 amu, has only two naturally occurring isotopes ( Br-79 and Br-81 ). The mass of Br-81 is 80.9163 amu, and its natural abundance is 49.31%.

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