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What is the average atomic mass of oxygen?

April 26, 2017Atomic average mass oxygen

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What is the average atomic mass of oxygen?

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The average atomic mass of oxygen is 15.9994. Most atomic mass is concentrated in the protons and neutrons.Each proton or neutron weighs about 1 amu,and thus the atomic mass is always very close to total number of protons and neutrons in the nucleus.