Question

define the atomic mass unit (answer according to class 9 syllabus)​

Answer 1

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.

Answer 2

Answer:

the mass number also called atomic mass number or neutron