Elleeejpx
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does anyone know how to calculate a percentage abundance of two isotopes when the third has already been given??

I was given a question of something along the lines of chromium has three isotopes cr-52, cr-50 and cr-53
cr-52 has a 86.1% abundance. Calculate the percentage abundance for the other two isotopes (I think the mass overall was like 52.1)
Any help would be greatly appreciated
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shley2021
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As a percent, the equation would be: (x) + (100-x) = 100, where the 100 designates the total percent in nature. If you set the equation as a decimal, this means the abundance would be equal to 1. The equation would then become: x + (1 – x) = 1. Note that this equation is limited to two isotopes.
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