Use the atom builder interactive to identify each nucleus. Two protons represented as purple spheres and one neutron represented as a white sphere. Two protons represented as purple spheres and four neutrons represented as white spheres. Four protons represented as purple spheres and three neutrons represented as white spheres. One proton represented as a purple sphere and two neutrons represented as white spheres. Four protons represented as purple spheres and two neutrons represented as white spheres. Three protons represented as purple spheres and four neutrons represented as white spheres. Answer Bank