Question

Which halogen can form only one oxidation state other than zero?

Answer 1

i think its fluorine but im not sure if its right but i do believe that it is not right

Answer 2

Fluorine, the most electronegative element in the periodic table, has a -1 oxidation state in its compounds, and a zero oxidation state in the free element, F2. So you are correct that is is correct and not correct in your believe it is not correct. How's that for confusing?