Question

Which subatomic particle has the least mass?
electron
proton
neutron
the atom

Answer 1

Answer:

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electron

Explanation:

However, neutrons are slightly heavier than protons but we generally assume them to be of the same mass. The mass of an electron is negligible as compared to that of neutrons and protons and thus the atomic mass is given as the sum of the mass of protons and neutrons.