Florine ion (F-) has 10 electrons
Further explanation
Fluorine (symbol F) is one of the halogen elements in the form of gas, located in period 2, group 17 and including the p block.
Has atomic number 9, with the electron configuration:
1s² 2s² 2p5⁵
Fluorine to obtain stability according to the noble gas element (neon) will bind one electron to form a negative ion (anion) F-, so that the electron configuration becomes
1s² 2s² 2p⁶, so there are 10 electrons (is not in the answer option)