Respuesta :

To calculate the mass of a single atom, you would need to add up the protons and neutrons of a single atom.
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To calculate the atomic mass of a single atom of an element, add up the mass of protons and neutrons. Example: Find the atomic mass of an isotope of carbon that has 7 neutrons. You can see from the periodic table that carbon has an atomic number of 6, which is its number of protons.