Answers to Chapter 5 "Standardized Test Prep"

1. d    2. b    3. a    4. Don't do.    5. d    6. (E)    7. (B)    8. (C)    9. (A)    10. (C)    11. c    12. c    13. d    14-17. Don't do.  18.  According to the aufbau principle, electrons enter orbitals of lowest energy first.  According to the Pauli exclusion principle, an orbital may contain at most two electrons.  According to Hund's rule, one electron will enter each orbital of equal energy before electrons begin to pair up.