Halide
A halide is a binary compound, of which one part is a halogen atom and the other part is an element or radical that is less electronegative than the halogen. Most salts are halides. All Group I Earth metals form halides with the halogens and they are white solids.
Metal halides are used in high-intensity discharge light bulbs, such as in modern street lights, because they are more energy-efficient than mercury vapour bulbs, and have much better colour rendition than orange high-pressure sodium bulbs.
Examples
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