Question

what are three likely differences in the properties of the compounds formed when aluminum and fluorine combines and when fluorine and fluorine combines

Answer 1

What are three likely differences in the properties of the compounds formed when aluminum and fluorine combines and when fluorine and fluorine combines?

Answer: When fluorine combines with aluminum, we obtain a solid compound $\mathrm{AlF}_3$ – it is a salt, which is called aluminum fluoride. This salt has a low chemical reactivity.

And, when fluorine combines with fluorine, we obtain a gaseous element $\mathsf{F}_2$ , which has a highest chemical reactivity among all known substances.

We can make a table to compare their properties: