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An atom of chlorine and an atom of bromine have the same:
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2. Atoms & Elements
Isotopes
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If the natural abundance of Br-79 is 50.69%, what is the natural abundance of Br-81?
A
29.31%
B
49.31%
C
81.00%
D
50.69%
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Understand that the natural abundances of isotopes of the same element must add up to 100%.
Identify the given natural abundance of Br-79 as 50.69%.
Set up the equation for the total abundance: \(\text{Abundance of Br-79} + \text{Abundance of Br-81} = 100\%\).
Substitute the known value: \(50.69\% + \text{Abundance of Br-81} = 100\%\).
Solve for the abundance of Br-81 by subtracting: \(\text{Abundance of Br-81} = 100\% - 50.69\%\).
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