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The average atomic mass of oxygen is 15.9994 amu. The atomic masses of its three isotopes are as follows: 0-16: 15.995 amu; 0-17: 16.999 amu; 0-18: 17.999 amu Which isotope is most likely to have the greatest abundance in nature?

User Thibaultbl
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it will be the one that had a closer mass to the average atomic mass. it will be O-16: 15.995 amu
User Opy
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