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The mass number is the sum of neutrons and protons in the atomic nucleus and is different for each isotope of any element.

For example the isotope oxygen-16 has the mass number 16.

The atomic weight of oxygen (not Atomic Mass) is [15,99903; 15,99977] after the IUPAC Tables - 2009.

The atomic number of oxygen is 8. The chemical symbol is O.

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