Question

What are three nonmetal elements that combine with only one fluorine atom to form a stable compound?

Answer 1

Well, interhalogen molecules are possible for a start......

Explanation:

And the interhalogens are `F-Cl`, `F-Br`, and `F-I`; mind you these might not be stable. Certainly `HF` fits your requirement. `C-F`, and `B-F` are known spectroscopically, but you might not be able to put these in a bottle.