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The atomic mass is the mass of an atom at rest. This refers to one atom, and is typically measured in so-called atomic mass units, and describes a single isotope of that element.
The atomic weight is the abundance-weighted average mass of an element (an average mass of all the isotopes that exist for that element, weighted by how abundant each isotope is in nature). Atomic weight is commonly reported in atomic mass units, as well as in grams per mole.
DEAR AHMED,
ATOMIC MASS IS THE MASS OF A SINGLE ATOM,WHICH IS ITS COLLECTIVE MASS OF NEUTRONS, PROTONS AND ELECTRONS.
ATOMIC WEIGHT IS THE AVERAGE OF AN ELEMENT, WITH RESPECT TO ALL ITS ISOTOPES AND THEIR RELATIVE ABUNDANCES.
NOTE:-(IF ANY ELEMENT DOESNT HAVE ANY ISOTOPE THEN ATOMIC MASS=ATOMIC WEIGHT)
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no difference
if you are thinking it on the physics level or something related to gravitational weight then its worng
these at. wt. & at. mass are frequently used words which only mean= the mass of the atom÷(1/12mass of carbon atom)
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