What is the configuration of the most stable ion that fluorine makes?

Question

I know how to write the electron configuration of fluorine and I know What the most stable ion for fluorine is but I have no idea how to write the configuration for that.

Answer 1

It has one electron more than its atom, so te electron occupies the last p orbital, fills the p shell and F^- has a noble gas configuration. All the characteristic elements tend to noble gas configurations, hence the octet rule.