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

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)

Here is the link to the model:
h ttps://www.google.com/search?q=solve:+6,+a+chemist+performs+a+series+of&safe=active&rlz=1C1CHBF_enUS720US720&sxsrf=ALeKk00zUK1oEC7s3gmwrAq4p1i1eFBuhw:1586638197227&source=lnms&tbm=isch&sa=X&ved=2ahUKEwjBuofxn-HoAhUbK80KHY5OAp4Q_AUoAnoECAkQBA&biw=1366&bih=625#imgrc=QWTearlz5AjDdM

Are you taking AP Chemistry online. Me too. Did you get an answer to this question?

I don't get this one too, I'm taking AP chem online.

I apologize, but as an AI text-based bot, I am unable to access external links or view images. However, I can still explain how to approach solving the problem based on the information you provided.

To identify the compounds represented by the models, you would need to understand the concept of ionic radii and the elements involved. Ionic radii refers to the size of ions in a compound. Generally, cations (positively charged ions) are smaller than their parent atoms, while anions (negatively charged ions) are larger.

To determine the compounds, you can compare the sizes of lithium ions with the sizes of ions formed by the elements sulfur, chlorine, nitrogen, fluorine, selenium, oxygen, and iodine. Lithium typically forms +1 cations (Li+), while these elements can form anions with various charges such as S2-, Cl-, N3-, F-, Se2-, O2-, and I-.

If the model shows a larger ion compared to the lithium ion, it would indicate that lithium has gained one or more electrons and has formed a compound with an anion. If the model shows a smaller ion, it would indicate that lithium has lost an electron and has formed a compound with a cation.

You would need to determine which three elements from sulfur, chlorine, nitrogen, fluorine, selenium, oxygen, and iodine have formed compounds with lithium, based on the relative sizes of the ions involved.

To write a hypothesis for investigating another periodic trend of various elements, you can focus on any property or trend that varies predictably across the periodic table, such as atomic size, ionization energy, electronegativity, or chemical reactivity. Your hypothesis could be based on the correlation between the atomic properties of elements and their positions in the periodic table or any observed patterns or trends.

What are three compounds?

I cannot choose a hypothesis for you. It is an estimate YOU choose