Halide

Jump to navigation Jump to search

WikiDoc Resources for Halide

Articles

Most recent articles on Halide

Most cited articles on Halide

Review articles on Halide

Articles on Halide in N Eng J Med, Lancet, BMJ

Media

Powerpoint slides on Halide

Images of Halide

Photos of Halide

Podcasts & MP3s on Halide

Videos on Halide

Evidence Based Medicine

Cochrane Collaboration on Halide

Bandolier on Halide

TRIP on Halide

Clinical Trials

Ongoing Trials on Halide at Clinical Trials.gov

Trial results on Halide

Clinical Trials on Halide at Google

Guidelines / Policies / Govt

US National Guidelines Clearinghouse on Halide

NICE Guidance on Halide

NHS PRODIGY Guidance

FDA on Halide

CDC on Halide

Books

Books on Halide

News

Halide in the news

Be alerted to news on Halide

News trends on Halide

Commentary

Blogs on Halide

Definitions

Definitions of Halide

Patient Resources / Community

Patient resources on Halide

Discussion groups on Halide

Patient Handouts on Halide

Directions to Hospitals Treating Halide

Risk calculators and risk factors for Halide

Healthcare Provider Resources

Symptoms of Halide

Causes & Risk Factors for Halide

Diagnostic studies for Halide

Treatment of Halide

Continuing Medical Education (CME)

CME Programs on Halide

International

Halide en Espanol

Halide en Francais

Business

Halide in the Marketplace

Patents on Halide

Experimental / Informatics

List of terms related to Halide


Overview

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, to make a fluoride, chloride, bromide, iodide, or astatide compound. Many salts are halides. All Group 1 metals form halides with the halogens and they are white solids.

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.

Halides in organic chemistry

In organic chemistry halides represent a functional group. Any organic compound that contains a halogen atom can be considered a halide. Alkyl halides are organic compounds of the type R-X, containing an alkyl group R covalently bonded to a halogen X.

Pseudohalides resemble halides in their charge and reactivity; common examples are azides NNN-, isocyanate -NCO, Isocyanide, CN-, etc.[1]

A chemical test for the detection of halogen in chemical substances is the Carius halogen method.

Halides in lighting

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.

HID (High-intensity discharge) lamps however, contribute highly to light pollution. Sodium-vapor are favored for this reason.

Halide compounds

Examples of halide compounds are:

See also

References

Template:WH Template:WikiDoc Sources