News tagged with chemical compounds

Related topics: molecules

Earwax: A new frontier of human odor information

Scientists from the Monell Center have used analytical organic chemistry to identify the presence of odor-producing chemical compounds in human earwax. Further, they found that the amounts of these compounds differ between ...

Feb 12, 2014
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Compound stymies polyomaviruses in lab tests

A team of scientists reports that a small molecule compound showed significant success in controlling the infectivity and spread of three polyomaviruses in human cell cultures. To date there has been no medicine ...

Nov 13, 2013
popularity 4.7 / 5 (3) | comments 0 | with audio podcast

Putting drug discovery back on target

'The world urgently needs new medicines for many diseases such as Alzheimer's, depression, diabetes and obesity,' says Professor Chas Bountra. 'Yet the pharmaceutical industry's success rate for generating ...

Oct 23, 2013
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Compounds point the way to cancer's dependencies

The Broad Institute's Center for the Science of Therapeutics today announced the launch of its Cancer Therapeutics Response Portal (CTRP; http://www.broadinstitute.org/ctrp/) – a critical resource for advancing the discovery of potential ...

Aug 29, 2013
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Chemophobia shouldn't be on the menu

or breakfast and lunch for that matter— many people suffer from chemophobia, an irrational fear of natural and synthetic chemicals that pose no risk to our health, a Dartmouth study finds.

Aug 14, 2013
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Study shows links between dust and breast milk

Concentrations of organic compounds called brominated flame retardants in New Zealand samples of dust and breast milk are "well below" limits imposed by international authorities, researchers from the College ...

Aug 13, 2013
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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).

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