atomic mass

The atomic mass (ma) is the mass of an atom at rest, most often expressed in unified atomic mass units. The atomic mass may be considered to be the total mass of protons, neutrons and electrons in a single atom (when the atom is motionless). The atomic mass is sometimes incorrectly used as a synonym of relative atomic mass, average atomic mass and atomic weight; however, these differ subtly from the atomic mass. The atomic mass is defined as the mass of an atom, which can only be one isotope at a time and is not an abundance-weighted average. The actual numerical difference is usually very small such that it does not affect most bulk calculations but such an error can be critical when considering individual atoms.
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Noun
1. (chemistry) the mass (in atomic mass units) of an isotope of an element
(hypernym) mass
(classification) chemistry, chemical science

1. The sum of protons and neutrons in an atom's nucleus. 2. The combined mass of all the particles in a given atom.

 Say it 
The average mass of an atom of an element, usually expressed in atomic mass units . The terms mass and weight are used interchangeably in this case. The atomic weight given on the periodic table is a weighted average of isotopic masses found in a typical terrestrial sample of the element.

Eng: atomic mass
Urdu: (کیمیا) ایٹمی کَمِیَت ۔