The document discusses Bohr's model of the atom and Lewis dot structures. Bohr's model represents the structure of atoms by showing the electrons orbiting the nucleus in defined energy levels. It provides steps for drawing Bohr's model, including calculating protons, neutrons, and electrons based on atomic number and mass. An example is worked through for carbon. Lewis dot structures depict the outer shell electrons of an element using the element's symbol and dots. Examples of Lewis dot structures are shown for carbon and sodium.