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ammonia
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Ammonia and amines have a slightly flattened trigonal pyramidal shape with a lone pair of electrons above the nitrogen. In quaternary ammonium ions, this area is occupied by a fourth substituent. ammonia boron trifluoride formation
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ammonia summary
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Chinese pictograph, calligraphy tablet of Huang Tingjian, a famous calligrapher in Ancient Song Dynasty. The background of Chinese cultural elements.
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Statue of Liberty in front of the skyline of Manhattan, New York City, New York.
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The Titanic. (disasters, ships)
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Queen Elizabeth II addresses at opening of Parliament. (Date unknown on photo, but may be 1958, the first time the opening of Parliament was filmed.)
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Bog body. Head of Tollund Man. Died at about age 30-40, Dated to about 280 BCE early Iron Age. Found Bjaeldskovdal bog Denmark in 1950 near Elling Woman. Most well preserved bog body to date. Human remains mummified in natural peat bogs. mummy, embalm
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earthquake. Heavily damaged school in the town of Yingxiu after a major earthquake struck China's Sichuan Province on May 12, 2008.
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ammonia: References & Edit History

Article Contributors

Primary Contributors

Other Contributors

  • Alexander More

Other Encyclopedia Britannica Contributors

Article History

Type Description Contributor Date
Add new Web site: Science - Ammonia—a renewable fuel made from sun, air, and water—could power the globe without carbon. Feb 15, 2024
Add new Web site: Cleveland Clinic - Ammonia Levels. Nov 07, 2023
Add new Web site: University of Bristol - Department of Chemistry - Ammonia. Aug 17, 2023
Add new Web site: Chemistry LibreTexts - NH3. Jul 07, 2023
Add new Web site: American Chemical Society - Ammonia. Mar 31, 2023
Add new Web site: United States Enviromental Protection Agency - Ammonia. Dec 09, 2022
Add new Web site: National Library of Medicine - Biochemistry, Ammonia. Sep 06, 2022
Added material about ammonia being a commonly used fertilizer in the United States and urea being the most common nitrogen fertilizer worldwide. Mar 06, 2017
Changed "Solvay process" to "the Solvay process." Added material about the use of hydroxylamine in the preparation of oximes. Apr 22, 2016
Add new Web site: The Fertilizer Institute - Ammonia Fact Sheet. Jan 21, 2016
Add new Web site: The Essential Chemical Industry Online - Ammonia. Jan 21, 2016
Add new Web site: Science is Fun - Chemical of the Week - Ammonia. Jan 20, 2016
Add new Web site: Buzzle.com - Ammonia. Dec 25, 2013
Added new Web site: How Stuff Works - Healthguide - Ammonia Poisoning. Sep 25, 2008
Article revised and updated. Aug 15, 2008
Article added to new online database. Jul 20, 1998
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