fluorine ion has a charge of -1, it has an extra elctron
NO !!!! Fluorine form an ANION , that is an ion eith negative charge. 'F^(-) '.
-1.
It gains a positive charge, generally being 1+
A fluorine ion has a charge of minus one.
10
the charge of an iron ion is 2+
A fluorine atom changes into a fluoride ion by gaining one electron and developing a 1- charge.
If you think to fluorine the ion is F- (charge 1-).
All the listed elements form ions with a charge of 1, if "1" is taken as the absolute value of the charge on the ion. For fluorine, however, the corresponding ion has a charge of -1.
Li ion has a charge of +!, lithium is in group 1, an alkali metal
Fluorine will gain one electron to form F- (or fluoride) ion. Fluoride ion has a charge of -1.
A Lithium ion has a charge of 1+ and a Fluoride ion has a charge of 1-, so Lithium and Fluorine pair in a 1:1 ratio.