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 (or more electropositive) than the halogen, to make a fluoride, chloride, bromide, iodide, or astatide compound. Many salts are halides. All Group 1 metals form halides which are white solids at room temperature.

A halide ion is a halogen atom bearing a negative charge. The halide anions are fluoride (F), chloride (Cl), bromide (Br), iodide (I) and astatide (At). Such ions are present in all ionic halide salts.

See chloride, bromide, fluoride, and iodide



Halide compounds such as KCl, KBr and KI can be tested with silver nitrate solution, AgNO3. The halogen will react with Ag+ and form a precipitate, with varying colour depending on the halogen:

  • AgF: No Precipitate
  • AgCl: White
  • AgBr: Creamy (Pale Yellow)
  • AgI: Green (Yellow)

For organic compounds containing halides, the Beilstein test is used.


Metal halides are used in high-intensity discharge lamps called metal halide lamps, such as those used in modern street lights. These are more energy-efficient than mercury-vapor lamps, and have much better colour rendition than orange high-pressure sodium lamps. Metal halide lamps are also commonly used in greenhouses or in rainy climates to supplement natural sunlight.

Halides are also used in solder paste, commonly as a Cl or Br equivalent.[1]


Examples of halide compounds are:

See also


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  • halide — ► NOUN Chemistry ▪ a binary compound of a halogen with another element or group: silver halide …   English terms dictionary

  • Halide — Halide, nach Berzelius neutrale organische Verbindungen, die sich aber von anderen ähnlichen dadurch unterscheiden, daß sie wie die unorganischen aus einer Base u. einer Säure bestehen, welche erstere in diesem Falle ein Oxyd ist, das auf… …   Pierer's Universal-Lexikon

  • halide — a compound of a halogen and a metal radical, 1876, from HALO (Cf. halo ) + chemical suffix IDE (Cf. ide) …   Etymology dictionary

  • halide — [hal′īd, hal′id; hā′līd΄, hā′lid] n. [ HAL(OGEN) + IDE] a compound in which a halogen is combined with a certain element, radical, etc. adj. HALOID …   English World dictionary

  • halide — di·halide; halide; hy·dro·halide; oxy·halide; per·halide; pho·to·halide; poly·halide; pseu·do·halide; sub·halide; tri·halide; …   English syllables

  • halide — /hal uyd, id, hay luyd, lid/, n. 1. a chemical compound in which one of the elements is a halogen. adj. 2. of, pertaining to, or characteristic of a halide. [1875 80; HAL(OGEN) + IDE] * * * …   Universalium

  • halide — noun A salt of any halogen acid. Potassium iodide is a halide …   Wiktionary

  • halide — /ˈheɪlaɪd/ (say hayluyd), /ˈhæl / (say hal ) noun 1. a compound, usually of two elements only, one of which is a halogen. –adjective 2. of the nature of, or relating to, a halide; haloid. Also, halid /ˈheɪləd/ (say hayluhd), /ˈhæl / (say hal ).… …   Australian English dictionary

  • halide — noun Date: 1855 a binary compound of a halogen with a more electropositive element or radical …   New Collegiate Dictionary

  • halide — A salt of a halogen. * * * ha·lide hal .īd, hā .līd n a binary compound of a halogen with a more electropositive element or radical * * * hal·ide (halґīd) 1. haloid. 2. a binary compound of one of the halogens (fluorine, chlorine, bromine,… …   Medical dictionary