What does c12 mean?

Related questions

1. Why are elements important to life?
2. How are elements used in everyday life?
3. Why do we need periodic table?
4. Why is the periodic table is such a useful tool?
5. What is Boron's weakness?
6. How do you calculate abundance of isotopes?
7. Whats the relationship between natural abundance and stability?
8. How we can calculate atomic mass?
9. What is the difference between a stable and unstable isotope?
10. Which element is the most reactive?

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