Question

what is the most common ion charge for iodine, a group 7a element? +1 +2 -1 -2

Explanation:

Iodine is a group 7A (halogen) element. Halogens have 7 valence electrons. They tend to gain 1 electron to achieve a stable octet configuration. Gaining 1 electron gives an ion charge of -1.

Answer:

-1