General Chemistry Interview Question:

why in atomic mass electron is not include while proton and neutron include? although electron is a part of atom?

Submitted by: Administrator

Electrons are moving around the orbit of the atom.According
to Heisenberg principle 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.
Submitted by: Administrator