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With a relative atomic mass of 15.994914, oxygen-16 is a stable isotope of oxygen. The oxygen isotope that is most prevalent in nature (99.76 percent by weight).
Take the atomic number (Z) 8 of oxygen as an example. So, oxygen atoms have eight protons. There are typically 8 neutrons in oxygen atoms. Eight neutron oxygen atoms would have a mass of roughly 16 amu (8 p+ + 8 n0) and a mass number of 16 (8 p+ + 8 n0). Atomic weight 2.014 is assigned to deuterium. Natural hydrogen compounds make up around 0.0156 percent of the stable atomic species.
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