what do you think you know about physics, physics is the study of matter under the effect of energy, but does this includes solid states bodies, atoms at ground states, object at microscopic size or object moving faster than light? these and more is what prompt me to ask again what is physics?
why does the mass number of an atom not include the electrons?
the mass number is the sum of protons and neutrons and not the atomic
mass of the atom. similarly the mass of the electron is negligible to be added
to the atomic mass.
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