The Atomic Mass of Oxygen is: 15.999
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the element that has an atomic mass of 16.00 is sulfer.
Look on the Periodic Table. The bottim number is the Atomic Mass and the top is the atomic number. ex. The atomic mass for O (oxygen) is 16.
The atomic mass of carbon is approximately 12.01 atomic mass units.
The rounded atomic mass of oxygen is 16.00 amu (atomic mass units).
The relative atomic mass of oxygen is determined by taking the weighted average of the isotopic masses of its naturally occurring isotopes (O-16, O-17, O-18) in respect to their abundance in nature. This calculation gives an average value close to 16, which is the standard atomic mass unit for oxygen.