Final answer:
The correct ground-state electron configuration for a fluoride ion (F-) is 1s²2s²2p⁶.The correct option is b.
Step-by-step explanation:
The ground-state electron configuration of a fluorine ion, specifically the fluoride ion (F-), is sought. The neutral atom of fluorine has the electron configuration 1s²2s²2p⁵. Upon gaining an additional electron to become the fluoride ion, its configuration is completed to 1s²2s²2p⁶. This is because the gained electron fills the 2p orbital, which can hold a maximum of six electrons.
Thus, the correct answer is b) 1s²2s²2p⁶. The other configurations provided represent different ions or atoms with incorrect subshell completions for a fluorine ion.