Multiple Choice
How many protons do all isotopes of copper (Cu) have?
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2. Atoms & Elements
Isotopes
Multiple Choice
Which of the following is closest to the natural abundance of the isotope Br-79?
A
23.1%
B
75.4%
C
10.8%
D
50.7%
Verified step by step guidance1
Understand that natural abundance refers to the percentage of a specific isotope found naturally in a sample of an element.
Recall that bromine (Br) has two main isotopes: Br-79 and Br-81, and their natural abundances must add up to 100%.
Recognize that the natural abundance of Br-79 is approximately half of the total bromine isotopes, so it should be close to 50%.
Compare the given options (23.1%, 75.4%, 10.8%) to the expected value near 50%, and identify which is closest.
Confirm that the correct natural abundance of Br-79 is about 50.7%, which is not listed among the options, indicating the answer should be closest to this value.
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