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To solve this problem, we need to complete the information for the missing isotope of carbon, which will be **Carbon-12** (written as \(^{12}\text{C}\)), given that the naturally occurring stable isotopes of carbon are \(^{12}\text{C}\) and \(^{13}\text{C}\).

### Steps to solve:

1. **Identify the Mass of \(^{12}\text{C}\):**
   The atomic mass of \(^{12}\text{C}\) is approximately **12.000 amu** (atomic mass units) by definition, as this isotope is used as the standard for atomic masses.

2. **Natural Abundance of \(^{12}\text{C}\):**
   Since the natural abundance of \(^{13}\text{C}\) is given as 1.07%, the abundance of \(^{12}\text{C}\) will be:
   \[
   100\% - 1.07\% = 98.93\%
   \]

### Filling in the Table:

| Isotope  | Mass (amu) | Natural Abundance (%) |
|----------|------------|-----------------------|
| \(^{12}\text{C}\) | 12.000 | 98.93 |
| \(^{13}\text{C}\) | 13.003 | 1.07 |

Would you like more details on isotopes or atomic mass units?

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Here are some follow-up questions to expand your understanding:

1. Why is \(^{12}\text{C}\) used as the reference for atomic mass units?
2. How is the average atomic mass of carbon calculated using isotope abundances?
3. What are some applications of isotopic analysis in fields like archaeology or geology?
4. Why are natural abundances not always exact integers?
5. What are other elements that have naturally occurring isotopes?

**Tip:** Always verify that the sum of the natural abundances of isotopes equals 100%.

There are only two naturally-occurring stable isotopes of carbon. The mass and natural abundance of one of them is listed in the table below. Use whatever data you need from the ALEKS Periodic Table to determine the identity, mass, and natural abundance of the other isotope, and complete the table. Round your entry for mass to 4 significant digits and your entry for natural abundance to 4 significant digits.

Learn how to calculate the mass and natural abundance of carbon isotopes using the provided data. This solution explains isotopic abundance calculations for Carbon-12 and Carbon-13, suitable for high school students.

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