The mass of an electron is less than the mass of a neutron. Option 4 is correct.
An electron has a negative charge with amu of 0 mass while a proton has a positive charge with a mass of 1.0072764 amu
From the values, we can see that the atomic mass unit of a proton is greater than that of an electron.
Similarly, an electron has an atomic mass unit of 1.008665. This shows that the mass of an electron is less than the mass of a neutron.
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