How is atomic mass defined?

Related questions

1. Why does the second period have 8 elements?
2. Why the number of elements in the third period is 8?
3. How do we calculate atomic mass?
4. What do numbers on periodic table mean?
5. What is 5 on the periodic table?
6. What is the highest atomic number?
7. Why did Mendeleev call it the periodic table?
8. What is atomic mass number?
9. How mass number is calculated?
10. Where is the atomic number?

Tags

1. #after
2. #measured
3. #carbon
4. #element
5. #oxygen
6. #based
7. #chemistry
8. #formerly
9. #units
10. #hydrogen
11. #isotope
12. #taken