Question

explain about atomic mass​

Answer 1

Explanation:

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. ... 1 atomic mass unit is defined as 1/12 of the mass of a single carbon-12 atom.

Answer 2

Atomic weight, also called relative atomic mass, ratio of the average mass of a chemical element’s atoms to some standard. Since 1961 the standard unit of atomic mass has been one-twelfth the mass of an atom of the isotope carbon-12. An isotope is one of two or more species of atoms of the same chemical element that have different atomic mass numbers (protons + neutrons). The atomic weight of helium is 4.002602, the average that reflects the typical ratio of natural abundances of its isotopes.......

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