Which of the following is accurate in describing the placement and classification of iodine?

You can answer this question by only searching the element in the periodic table.

The atomic number of iodine, I, is 53. It is placed in the column 17 (this is the Group) and row 5 (this is the Period).

The conclusion is that the iodine is located in Period 5, Group 17, and is classified as a nonmetal.

An example of a monatomic cation would be Cs+. As this is the only cation that consists of a single atom.