Question

What is the name and symbol of the element that has been used as a standard substance to define the relative atomic mass?​

Answer 1

Answer:

Relative atomic mass (symbol: Ar) or atomic weight is a dimensionless physical quantity defined as the ratio of the average mass of atoms of a chemical element in a given sample to the atomic mass constant. The atomic mass constant (symbol: mu) is defined as being 112 of the mass of a carbon-12 atom.

Answer 2

Explanation:

carbon and the symbol is c will be define as atomic mass of the substance