Question

the relative mass of an atom or molecule is considered by considering the mass of a light atom and relating the mass of other at atoms or molecules to it give reason​

Answer 1

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.

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Answer 2

Dear student

Atomic mass: The mass of an atom is known as the atomic mass.

It is difficult to determine the mass of an individual atom. So we use Relative atomic mass. It can be determined by comparing the mass of a particular atom with that of an atom of standard reference.

In 1961, IUPAC (International Union of Pure and Applied Chemistry) adopted one-twelfth of the mass of a carbon-12 isotope as the standard unit to measure relative atomic masses.