Final answer:
Halogens tend to form ions with a charge of -1.
Step-by-step explanation:
Halogens tend to form ions with a charge of -1. This means that they gain one electron to achieve a stable octet configuration. For example, in the compound NaCl, sodium (Na) ionizes to form Na+, while chlorine (Cl) ionizes to form Cl-. The charge of the halogens can be predicted by their position on the periodic table, as they are located in group 17, which is known as the halogen group.