элемент

элемент

An element is a substance composed of atoms with identical atomic number . The older definition of element (an element is a pure substance that can't be decomposed chemically) was made obsolete by the discovery of isotopes .

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Κλάδος/Τομέας: Chemistry
Category: General chemistry
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Chemistry; General chemistry

A compound that consists of only carbon and hydrogen, that contains at least one carbon-carbon double bond. Alkene names end with -ene. Examples are ethylene (CH2=CH2); 1-propene ...

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An elementary particle produced by certain nuclear decay processes. Neutrinos have no charge and extremely small masses compared to other subatomic particles.

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1. An -OH group within a molecule. 2. A free radical formed by abstraction of a hydrogen atom from water.

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Κλάδος/Τομέας: Mobile communications Category: Mobile phones

iPhone 4

The latest Apple iPhone as of June 15, 2010. iPhone 4 comes with such features as FaceTime, Retina display, multitasking, HD video, and a 5-megapixel ...