Question

Why is Carbon-12 used in AMU?

Answer 1

Carbon-12:

1. Carbon-12 is the most common of the two stable carbon isotopes, accounting for 98.93 percent of all carbon on Earth.

AMU:

1. Carbon-12 is the sole atom with the same whole-number mass as the AMU (atomic mass unit) scale, it is utilized in AMU.
2. Carbon-12 is claimed to be a pure isotope on which to build the system.
3. The atomic weights of all other elements are now measured relative to carbon-12, which has supplanted oxygen as the standard relative.

Hence, Carbon-12 is used in AMU.