We use an atom of _______ as the standard particle for comparing the masses of atoms of other elements.

The elements used for standardizing the atomic mass or molecular mass were:

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?

Atomic mass tells us how heavy is an atom as compared to 1/12th mass of the carbon.

Name an isotope of an element which is used as reference for atomic mass unit.