The mass of an electron is approximately:
negligible compared to proton
Mass of an electron ≈ 9.1 × 10⁻³¹ kg, while the mass of a proton ≈ 1.67 × 10⁻²⁷ kg.
Ratio: \(\frac{m_p}{m_e} \approx 1836\), so an electron's mass is about \(\frac{1}{1836}\) of a proton's mass.
This is why the electron's mass is taken as negligible, and the mass of an atom is concentrated in its nucleus.
It is therefore neither double nor equal to the proton's mass, and the neutron's mass is almost the same as the proton's, so the electron is not the same as the neutron either.
Hence, the answer is negligible compared to proton.
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