what is the most common ion charge for fluorine? +1 +2 -1 -2

what is the most common ion charge for fluorine? +1 +2 -1 -2
Answer
Brief Explanations:
Fluorine is in Group 17 of the periodic - table. It has 7 valence electrons and gains 1 electron to achieve a stable octet. Gaining 1 electron gives it a charge of - 1.
Answer:
C. -1