Question

he average atomic mass of oxygen is 15.9994 amu. The atomic masses of its three isotopes are as follows:

O-16: 15.995 amu; O-17: 16.999 amu; O-18: 17.999 amu

Which isotope is most likely to have the greatest abundance in nature?

Answer 1

since atomic mass is a weighted average of all the naturally occuring isotopes of an element, the most common isotope is usually the one closest to the average (since it provides the largest mass contribution)

Answer 2

what is the answer

Answer 3

but which one