Halide ions are negatively charged ions formed when halogen elements, such as fluorine, chlorine, bromine, and iodine, gain an electron. These ions are important in various chemical reactions and play a crucial role in the formation of salts, like sodium chloride (table salt). Each halide ion has a specific charge of -1, which means they can easily combine with positively charged ions, known as cations, to create stable compounds. In addition to their role in forming salts, halide ions are also found in many biological and industrial processes. For example, fluoride ions are added to toothpaste to help prevent cavities, while iodide ions are essential for proper thyroid function in humans. Understanding halide ions is important