Question

Which particles have approximately the same size and mass?

• A. protons and electrons
• B. protons and neutrons
• C. electrons and neutrons
• D. electrons and neucleons

Answer 1

The correct option is B

protons and neutrons

The mass of proton = 1.67262178 $\times$ ${10}^{-27}$ kg.

The mass of neutron is = 1.6749 $\times$ ${10}^{-27}$ kg.

The mass of electron = 9.10938291 $\times$ ${10}^{-31}$ kg.

Mass of electron <<mass of neutron and mass of proton.

Thus we can see that the mass of protons and mass of neutrons are approximately equal. The mass of electron is much lower than the mass of the proton and neutron.