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How is an elements atomic mass determined

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Another way to calculate the atomic mass of an element is to add up the masses 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.
User Mike Ratcliffe
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An element's mass is determined by adding up the masses of protons and neutrons.
User BrianHT
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