Question

why The relative mass of an atom or molecule is considered, by considering the mass of
a light atom & relating the mass
of other atoms or molecules to it.​

Answer 1

Answer:

ANSWER. An atomic mass (symbol: ma) is the mass of a single atom of a chemical element. It includes the masses of the 3 subatomic particles that make up an atom: protons, neutrons and electrons. Atomic mass can be expressed in grams.