Question

an atom contains one proton, one electron, and one neutron. which two particles are most similar in mass?
the neutron and the electron
the proton and the electron
the proton and the neutron
the neutron and the atom

Explanation:

Protons and neutrons are located in the nucleus of an atom. The mass of a proton is approximately \(1.6726\times10^{-27}\) kg, the mass of a neutron is approximately \(1.6749\times10^{-27}\) kg, and the mass of an electron is about \(9.1094\times10^{-31}\) kg. The mass of an atom is the sum of the masses of protons, neutrons, and electrons. Clearly, protons and neutrons have much more similar masses compared to other pairs.

Answer:

the proton and the neutron