Generally the weight of electron is not added to calculate the atomic mass. Why?
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there is a very common reason behind it that is electrons and nucleus are sub parts of atom and since the weight of electron is negligible in comparison of whole atom bcoz the weight of electron is 1800× or 2300× (approx) less than proton so u can imagine its weight in comparison to whole atom.
Although it is bcoz electron's weight is negligible therefore its not counted.
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The weight of electron is not added to calculate the atomic mass because the atomic weight of electron is to small which can be neglected
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