I am confused about this problem. Any help is appreciated.

Question

A chemist performs a series of reactions that produce binary lithium compounds. The elements include sulfur, chlorine, nitrogen, fluorine, selenium, oxygen, and iodine. The models below represent the ionic radii of compounds formed by reacting lithium with three of the elements.
a. Identify the three compounds that the models represent. Explain your answer. (2 points)

b. Write a hypothesis that the chemist might use when investigating another periodic trend of various elements. (2 points)

The picture of the model can be found by copying the question onto google and then going to images. You will see 3 compounds (each one having a small circle and large circle) labeled Compounds A through C. I can't post URLs so...

Answer 1

You can post the url by copying the url and leaving a single space between
h ttp: etc.

Answer 2

I will do that and repost it