which of the following is accurate in describing the placement and classification of iodine? a. iodine is located in period 5, group 17 and is classified as a nonmetal. b. iodine is located in period 17, group 5 and is classified as a nonmetal. c. iodine is located in period 6, group 7 and is classified as a metal. d. iodine is located in period 7, group 6 and is classified as a metal.