what is atomic mass no.
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atomic mass no.= no. of proton+no. of neutron , and if atom doesn't have charge then no. of electron +no. of proton but exact calculation of atomic mass no. is first one
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The atomic mass of an element is the average mass of the atoms of an element measured in atomic mass unit (amu, also known as daltons, D). The atomic mass is a weighted average of all of the isotopes of that element, in which the mass of each isotope is multiplied by the abundance of that particular isotope. (Atomic mass is also referred to as atomic weight, but the term "mass" is more accurate.)
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