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The question asks about determining the isotopic abundances of magnesium isotopes.

### Problem Breakdown:
Magnesium has three stable isotopes:
- \(^{24}\text{Mg}\) with mass 23.98 u (abundance given as 79%)
- \(^{25}\text{Mg}\) with mass 24.98 u
- \(^{26}\text{Mg}\) with mass 25.98 u

The total abundance for all isotopes should sum to 100%. We are asked to find the percentage abundances of \(^{25}\text{Mg}\) and \(^{26}\text{Mg}\) using the periodic table's atomic mass data for magnesium. The approximate atomic mass of magnesium from the periodic table is 24.305 u.

Let:
- \(x\%\) = abundance of \(^{25}\text{Mg}\)
- \(y\%\) = abundance of \(^{26}\text{Mg}\)

### Solution:
Using the mass balance equation:

\[
79\% \times 23.98 \, \text{u} + x\% \times 24.98 \, \text{u} + y\% \times 25.98 \, \text{u} = 24.305 \, \text{u}
\]

Since the total abundance is 100%, we also know:
\[
79 + x + y = 100
\]
So, \(x + y = 21\).

This is a system of two equations that we can solve for \(x\) and \(y\).

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### 5 Related Questions:
1. How do you determine the average atomic mass from isotopic abundances?
2. What are other common elements with multiple isotopes?
3. How do isotopic abundances affect the chemical properties of an element?
4. Can isotopes of magnesium be used in dating or tracing processes?
5. What are the applications of stable isotopes in scientific research?

### Tip:
When solving for isotope abundance, always check the periodic table for the atomic mass to ensure the calculation fits within a reasonable margin of the given data.

Magnesium mempunyai tiga isotop (24Mg, 25Mg, dan 26Mg) yang stabil dengan massa masing-masing 23.98 u, 24.98 u, dan 25.98 u. Jika diketahui isotop dengan kelimpahan terbanyak adalah 24Mg (79%), tentukan kelimpahan (%) masing-masing isotop (25Mg dan 26Mg). Gunakan data pada Tabel Periodik Unsur.

Learn how to determine the isotopic abundances of magnesium isotopes 25Mg and 26Mg, given the abundance of 24Mg (79%) and the atomic mass of magnesium from the periodic table (24.305 u). This problem uses algebraic techniques and is suitable for high school students.

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