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)

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...

You can post the url by copying the url and leaving a single space between

h ttp: etc.

I will do that and repost it

Sure, I can help you with that.

For part a, the question asks you to identify the three compounds represented by the models. Since you mentioned that there are three compounds labeled as Compounds A through C, we can proceed by examining the compounds represented by the models.

To identify the compounds, we need to consider the elements involved in the reactions and their resulting compounds with lithium. From the given elements (sulfur, chlorine, nitrogen, fluorine, selenium, oxygen, and iodine), we can match them with the compounds represented by the models.

You can start by examining each compound model and comparing it to the given elements' symbols:

- Compound A: Look for the element and its corresponding symbol that matches the small circle in Compound A's model. Repeat the same process for the large circle in Compound A's model.

- Compound B: Repeat the process for Compound B by identifying the element and its corresponding symbol that matches the small and large circles in its model.

- Compound C: Similarly, identify the element and its corresponding symbol that matches the small and large circles in Compound C's model.

Once you have identified the element(s) represented by each compound model, match them with the given elements (sulfur, chlorine, nitrogen, fluorine, selenium, oxygen, and iodine) to determine which compounds they correspond to.

For part b, the question asks you to write a hypothesis that the chemist might use when investigating another periodic trend of various elements. To do this, you need to understand what a periodic trend is. In the context of the periodic table, periodic trends refer to the regular patterns in certain properties of elements, such as atomic radius, ionization energy, electronegativity, etc., as you move across a period or down a group.

To create a hypothesis, you could choose an element property (e.g., atomic radius, electronegativity) and state a potential trend based on your understanding. For example, if you were investigating the periodic trend of atomic radius, your hypothesis could be:

"Hypothesis: As one moves from left to right across a period in the periodic table, the atomic radius of the elements decreases due to the increasing effective nuclear charge."

Remember, a hypothesis is an educated guess or statement that you can test or investigate through experimentation or further research.

I hope this helps! Let me know if you have any further questions.