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On the Periodic Table it is the number on the bottom of the element.

If you know the amount of neutrons you can add it to the number of protons to find the Atomic Mass NUMBER, which is a good approximate of the atomic mass.

Potassium (isotope 39), 19K(39), has 19 protons and 20 neutrons

19 + 20 = 39 atomic mass NUMBER, its atomic mass is 39.10 a.m.u.

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Q: How do you find out the atomic mass of an element?
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