Exam-style question
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An atom of carbon has 6 protons and 6 neutrons. Which of the following is a stable isotope of carbon?.
- A.12
- B.13
- C.14
- D.15
Model answer
What a good answer should say
- C-12
Explanation
Why this works
C-12 has 6 protons and 6 neutrons, giving a mass number of 12. It is the most abundant and stable isotope of carbon.
The other options have different neutron numbers and are less stable or unstable.
Common mistake
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