Compare model A with the model of the atom used today.
Use Figure 2.

A comparison should include both similarities and differences between the Plum Pudding model (Model A) and the modern atomic model. **Similarities:** * Both models contain positively charged components and negatively charged electrons. * Both models represent an atom that is electrically neutral overall, with the amount of positive and negative charge balancing out. **Differences:** * **Arrangement of Positive Charge:** In Model A, the positive charge is spread out as a diffuse sphere. In the modern model, the positive charge is concentrated in a tiny, dense nucleus at the center of the atom. * **Location of Electrons:** In Model A, electrons are randomly embedded within the positive sphere. In the modern model, electrons orbit the nucleus in specific energy levels or shells. * **Subatomic Particles:** The modern model includes neutrons (neutral particles) within the nucleus, which were not discovered at the time of Model A and are therefore absent. * **Structure:** Model A depicts the atom as a solid sphere. The modern model shows the atom as being mostly empty space, with the mass concentrated in the nucleus.