Question

the structure of the atom (continued)

1. magnesium has three isotopes. magnesium - 24 has a percent abundance of 78.99%. magnesium - 26 has a percent abundance of 11.01%. what is the percent abundance of magnesium - 25? assume that there are no other magnesium isotopes.

Explanation:

Step1: Set up the equation

Let the percent abundance of magnesium - 25 be \(x\). Since the sum of percent abundances of all isotopes is \(100\%\), we have the equation \(78.99\%+x + 11.01\%=100\%\)

Step2: Solve for \(x\)

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Answer:

The percent abundance of magnesium - 25 is \(10\%\)