Which best describes the relative positions of protons, neutrons, and electrons in an atom? a) protons and neutrons are in the center of the atom, and electrons move around in the cloud. b) electrons form a cloud that has protons and neutrons sprinkled throughout. c) neutrons are in a center of the atom, and protons and electrons move around them in a cloud. d) protons and electrons are held together by neutrons in the center of the atom