Question : The relative atomic masses of all elements have been found concerning an atom of:
Option 1: O16
Option 2: S32
Option 3: N15
Option 4: C12
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Correct Answer: C 12
Solution : The correct option is C 12
The relative atomic masses of all elements have been found concerning an atom of carbon-12 (C 12 ). The carbon-12 isotope was chosen as the reference standard for atomic masses. By definition, one atomic mass unit (u) is exactly 1/12th of the mass of a carbon-12 atom.
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