define average atomic mass
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The average atomic mass of an element is the sum of the masses of its isotopes, each multiplied by its natural abundance (the decimal associated with percent of atoms of that element that are of a given isotope). ... The atomic number of chlorine is 17 (it has 17 protons in its nucleus).
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Answer: sum of number of protons and neutrons present in the nucleus of atom is called as atomic mass and the average of atomic mass is called as average atomic mass or or the the weight of all atoms in the the average is called as a average atomic mass please this is not exact answer you referred the guide or after your teacher then asking in phone
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