why in atomic mass electron is not include while proton and
neutron include? although electron is a part of atom.
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Answer Posted / r.raja
electrons are moving around the orbit of the atom.According
to Heisenberg prniciple position and momentum(P) of a
moving particle cannot be determined simultaneously at one
instance. since mass is to be determined from the formula m
= P/v, where P is the momentum and v is the velocity of the
electron.even if we can able determine the velocity we
can't determine the momentum at that time. hence the mass
can't be determined.hence it is negleced from the atomic
mass calculation.
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