News tagged with chemical compounds

Related topics: molecules

Illuminating the broad spectrum of disease

In a paper published in Nature Biotechnology, researchers from the Broad Institute of MIT and Harvard and the Dana-Farber Cancer Institute describe a new method that dramatically simplifies an arduous experimental process ...

Feb 29, 2016
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Could bacteria help fight colorectal cancer?

Obesity is a major risk factor for developing colorectal cancer, the second leading cause of cancer deaths in the United States. But someday doctors may be able to lessen the effect of that risk factor.

Dec 03, 2015
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Tissue chips predict neurotoxicity

A lot of time, money, and effort are devoted to developing new drugs. Yet only one of every 10 drug candidates entering human clinical trials successfully goes on to receive approval from the Food and Drug Administration ...

Oct 01, 2015
popularity5 comments 0

Chemical compound

A 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).

This text uses material from Wikipedia, licensed under CC BY-SA

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