Question

Why
standared reference for
measwing
was the selection of oxygen-16 isotope as the
vena atomic masses
considered relevant ?
mox​

Answer 1

Answer:

I know the answer but sorry I can't type it now because it is so huge

I'm extremely sorry

Answer 2

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1) The reference was basically changed due to existence of other isotopes of oxygen. ... Natural oxygen also contains small percentage of other isotopes as well. So, it was found that the atomic mass of 16 actually represents the average of atomic masses of 3 isotopic forms of oxygen.