Compare and contrast the three subatomic particles within a neutral atom was a test question to which jessie provided the following the atom contains protons, neutrons, and electrons. the protons and neutrons are both located in the nucleus and have the same mass. the electrons are located in the electron cloud and have very little to no mass. the proton and electron both have a positive charge and the neutron has a neutral charge. what was marked wrong in jessie's answer?