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-1:

Ions such as fluorine always have a Negative charge- when looking at the Periodic Table you will see groups 8,7,6,5,4 and 3 on the right side. All noble gases in Group 8 have no charge, but going to the left:

7 = -1 charge

6 = -2 charge

5 = -3 charge

4 = -4 charge

This only works for nonmetals, not transition metals so be careful.

So, looking at Fluorine it is in Group 7

7 Nonmetals always have a -1 charge.

-1 is the correct answer.

If you are asked to find the charge of 2 or more F ions, multiple the number of ions by -1.

Good luck :)

Read more: What_is_the_charge_of_two_ions_of_fluorine_F2

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