Answer: -
-1
Explanation: -
There are 53 protons in the given iodide ion.
Each proton carries +1 positive charge.
So net positive charge = 53 x +1 = +53.
There are 54 electrons in the iodide ion.
Each electron has - 1 negative charge.
So net negative charge 54 x -1 = -54
Net charge= +53 - 54
= -1
Thus an iodide ion has - 1 net charge on the ion.
