Question

Why the atomic masses are based on carbon 12 as standard?

Answer 1

Carbon-$12$:

• Carbon- $12$ is an isotope of carbon with mass no. $12$ .
• It is the maximum considerable carbon isotope and is used as an atomic weight standard.

Carbon-$12$ as the reference point for figuring the atomic masses :

• Six protons, six neutrons, and six electrons make up carbon-$12$ .
• There aren't any different nuclides aside from carbon- $12$ which have absolute (whole) numbers on this scale.