Fluorine can form ions with a -1 charge, which means it gains one electron. In general, if an atom gains electrons, it becomes negatively charged and forms an anion. Therefore, in this case, fluorine forms an anion.
Fluorine has a strong tendency to gain one electron to achieve a stable electron configuration, which results in a -1 charge. In chemistry, an ion with a negative charge is called an anion. Therefore, fluorine with a -1 charge is classified as an anion.
