the atom of this element is used as the standard reference for measuring atomic masses
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The original standard of atomic weight, established in the 19th century, was hydrogen, with a value of 1. From about 1900 until 1961, oxygen was used as the reference standard, with an assigned value of 16. The unit of atomic mass was thereby defined as 1/16 the mass of an oxygen atom.
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Explanation:
In 1961 C-12 isotope was chosen as the standard reference for measuring atomic mass.
Answer : C-12
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