Do electrons affect atomic mass?

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Solution

The mass of an electron is $9.1093837 \times 10^{- 31}$ $Kg$ and the mass of a proton is $1.67262192 \times 10^{- 27}$ $Kg$ . This means that the mass of an electron is only $\frac{1}{1836}$ of the mass of a proton.
Mass of a neutron is $1.67493 \times 10^{- 27}$ $Kg$ , which is again $1839$ times the mass of an electron.
Since the mass of an electron is extremely less when we compared it with the mass of a proton and a neutron, we do not include the mass of an electron while calculating the atomic mass or mass number of an element.
So, no electron does not affect atomic mass.

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