1. Excited State vs. Ground State STATION 1 This smiley face indicates the directions for a given page. Look for the smiley face on each page!

2. GROUND STATE This is a stable state This is where the electron normally wants to be COPY THE BOX TO YOUR NOTES

3. LOOKING AT THIS, WHAT DO YOU THINK EXCITED STATE IS? e-e- e-e- Ground state Excited state Electrons can only be at specific energy levels, NOT between levels.

4. EXCITED STATE This is a unstable state This is where the electron is farther from the nucleus than normally COPY THE BOX TO YOUR NOTES

5. An Excited Lithium Atom Zumdahl, Zumdahl, DeCoste, World of Chemistry  2002, page 326 Photon of red light emitted Li atom in lower energy state Excited Li atom Energy When an electron falls From an excited state Back to ground state, is Energy released or Absorbed?

6. An Excited Lithium Atom Zumdahl, Zumdahl, DeCoste, World of Chemistry  2002, page 326 Photon of red light emitted Li atom in lower energy state Excited Li atom Energy

7. Excitation of Hydrogen Atoms Zumdahl, Zumdahl, DeCoste, World of Chemistry  2002, page 328

8. Return to Ground State

9. OCTET RULE? Atom wants to have 8 valance electrons! WHY DO YOU THINK THAT IS? Atom is most stable when valance electrons = 8

10. HOW DOES THE OCTET RULE APPLY TO GROUND VS EXCITED STATE? When lower levels are not filled (aka less than 8 electrons in a shell) before the valance shell (last shell) the atom is EXCITED! CAN AN ATOM HAVE EMPTY SHELL IN LOWER LEVELS BEFORE IT STARTS TO FILL HIGHER LEVELS?

11. WHICH ONE IS GROUND AND WHICH IS EXCITED?