Chemical compound
hideA chemical compound is a pure chemical substance consisting of two or more different chemical elements that can be separated into simpler substances by chemical reactions and that have a unique and defined chemical structure. Chemical compounds consist of a fixed ratio of atoms that are held together in a defined spatial arrangement by chemical bonds. Chemical compounds can be compound molecules held together by covalent bonds, salts held together by ionic bonds, metallic compounds held together by metallic bonds, or complexes held together by coordinate covalent bonds. Substances such as pure chemical elements and elemental molecules consisting of multiple atoms of a single element (such as H2, S8, etc.) are not considered chemical compounds.
Elements form compounds to become more stable. They become stable when they have the maximum number of possible electrons in their outermost energy level, which is normally two or eight valence electrons. This is the reason that noble gases do not frequently react: they already possess eight valence electrons (the exception being helium, which requires only two valence electrons to achieve stability).
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News tagged with chemical compounds
Researchers find possible environmental causes for Alzheimer's, diabetes
Jul 06, 2009 |
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A new study by researchers at Rhode Island Hospital have found a substantial link between increased levels of nitrates in our environment and food with increased deaths from diseases, including Alzheimer's, diabetes mellitus ...
Taking the Resistance Out of Drug-Resistant Infections
Apr 10, 2009 |
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(PhysOrg.com) -- It started out as a research project focused on getting rid of harmful bacterial accumulations called biofilms. Now it has the potential to make conventional antibiotics work against stubborn, drug-resistant ...
Mass spec technique analyzes defensive chemicals on seaweed surfaces for potential drugs
Apr 06, 2009 |
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A new analytical technique is helping scientists learn how organisms as simple as seaweed can mount complex chemical defenses to protect themselves from microbial threats such as fungus. Known as desorption ...
Study: Soybean oil reduces carbon footprint in swine barns
Feb 26, 2009 |
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One of agriculture's most versatile crops could one day play a role in combating climate change, Purdue University research shows.
Building a better protein
Feb 23, 2009 |
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Proteins are widely viewed as a promising alternative to synthetic chemicals in everything from medications to hand lotion. The naturally occurring molecules have been shown to be more efficient and effective than many of ...
Data mining promises to dig up new drugs
Feb 02, 2009 |
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(PhysOrg.com) -- A robot scientist that can make informed guesses about how effective different chemical compounds will be at fighting different diseases could revolutionise the pharmaceutical industry by ...
