Question

Define atomic mass UNIT(amu) and why is it needed​

Answer 1

Atomic mass unit is defined as a mass exactly equal to one-twelfth the mass of one carbon-12 atom. It is the standard for measuring the atomic mass of the other elements. Simply, it can be represented as amu

Answer 2

Answer:

An atomic mass unit (symbolized AMU or amu) is defined as precisely 1/12 the mass of an atom of carbon-12. The carbon-12 (C-12) atom has six protons and six neutrons in its nucleus. ... The AMU is used to express the relative masses of, and thereby differentiate between, various isotopes of elements.

Explanation: