Question

what is unit for presenting atomic mass​

Answer 1

Answer:

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Atomic weight is measured in atomic mass units (amu), also called daltons. ... measured in terms of the atomic mass unit, which is defined to be 1/12 of the mass of an atom of carbon-12, or 1.660538921 × 10−24 gram.

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Answer 2

Unified mass – u

It has been selected as "u" as the unit of measuring atomic mass. It is equivalent to one-twelfth of an atom of Carbon - 12 isotope. But, initially, it was selected as one-sixteenth of an atom of Oxygen as,

• Oxygen reacted with many elements to form compounds, and
• Oxygen gave relative masses on whole numbers.

Moreover, 1 u = 1.66 × 10^-27 kg.