An atom contains one proton, one electron, and one neutron. Which two particles are most similar in mass?
A. the neutron and the electron
B. the proton and the electron
C. the proton and the neutron
D. the neutron and the atom
Answer (1)
The two particles that are most similar in mass in an atom are the proton and the neutron, both having a mass of about 1 atomic mass unit (amu), whereas the electron is significantly lighter. Protons and neutrons are crucial for determining an atom's mass, while electrons have a much smaller mass. Therefore, the correct choice is 'the proton and the neutron.' ;
