Explanation:Related elements, including the noble gases, halogens, alkali metals, alkaline earth metals, transition metals, lanthanides, and actinides. In addition, metals, nonmetals, and metalloids form loosely defined families. Other family designations—such as carbon family—are sometimes used.HalogensHalogens: - Group 17 (VIIA) - 7 valence electrons.Groups are numbered 1–18 from left to right. The elements in group 1 are known as the alkali metals; those in group 2 are the alkaline earth metals; those in 15 are the pnictogens; those in 16 are the chalcogens; those in 17 are the halogens; and those in 18 are the noble gases.
Protection from corrosion.
Beneath the paint or finish of a car is a bare metal of a car body. We know that over time, paints and finish dry out, crack and peel. Once they do, the metal is exposed. To protect the car, a thin protective layer made of softer metal but is more resistive to corrosion, is deposited on the car body before painting. Thus making the car body more resistant to corrosion.
Add: why not make the whole car out of this less corrosive material? Because this material is too soft. So it takes twice or more amount of this metal to match the stiffness of current material used in car bodies. This would then raise weight and cost of the car.