The document contains a chapter review on electrons in atoms, covering topics such as how many electrons can fit in an energy level, how to fill electron configuration diagrams, the three rules for electron configurations, determining an element's number of valence electrons, relating an element's period to its number of occupied energy levels, drawing Lewis dot structures, recognizing ground and excited states based on electron configuration, and what happens to electrons as they fall to the ground state.

1. Name _____________________________________________ Date ________________
Chapter 5 Review
“Electrons in Atoms”
• How many electrons can fit into an energy level?
• How many possible electrons can exist in each energy level?
• Which energy shells have the most energy, which have the least?
• Based on the modern model of the atom, where can you find electrons?
• Know how to fill up an “Aufbau” diagram (electron configuration diagram)
• What are the three rules for electron configurations?

2. • What are valence electrons?
• Know how to determine the number of valence electrons for any element (There are
three ways to do this)
• How does the period of an element relate to the number of occupied principal energy
levels (shells)
• Know how to draw a Lewis dot structures for any element
• What is the ground state and excited state of an atom?
• Know how to recognize an atom as in its ground state or excited state based on its
electron configuration
• What happens to electrons as they fall back to the ground state?