What type of ions do halogens form when reacting with metals?

When halogens react with metals, they typically gain one electron to achieve a stable electron configuration, forming negatively charged ions known as anions. These ions carry a charge of -1 and are collectively referred to as halides. This process reflects the halogens' natural tendency to seek electron configuration similar to that of the nearest noble gas, which provides them with greater stability. The formation of halide ions occurs during the reaction with metals, which donate electrons.

This understanding highlights the significance of electron transfer in ionic bonding, where metals lose electrons and halogens gain them, resulting in the creation of ionic compounds composed of positively charged metal ions and negatively charged halide ions.