why was oxygen replaced by carbon-12 as the reference for measuring the atomic masses

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Solution

For measuring relative atomic mass, Oxygen-16 was once the standard. As Oxygen-17 and Oxygen-18 are also abundant in the Oxygen led to varying scales of mass and different atomic tables. Carbon-12 is more abundant and is 98.89% of carbon. It was chosen due to it's coherence to Avogadro's Principle, stability and abundance.

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Q.
Why is Carbon 12 isotope used as a standard reference for measuring atomic mass?

Q. Why oxygen was removed from being considered as the standard unit for measuring the atomic mass.? And now why we are using carbon 12 atom?
what is carbo 12 atom?

why was c-12 isotope accepted as the standard of measuring the atomic mass of elements inspite of hydrogen and oxygen erlier being the standard? why was no other elements taken for this choice?

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