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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Neon is a non meta element. Atomic mass of it is 20.
Nitrogen, element 7, has an atomic mass of 14.0067, rounded to 14.007.
Atomic mass of an element measures the mass of that element on a molecular scale, taking into account neutrons and protons, which weigh approximately 1. Electrons are negated. Atomic mass is also the mass, in grams, of 1 mole of that element.
Mercury has an atomic mass of 200.
Vanadium is the element that has an atomic weight of 50.942.