Definition of Chemical element

Babylon English
chemical element
fundamental building blocks of chemical compounds

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Chemical element definition was found in categories: Language, Idioms & Slang(2)  Society & Culture(2)  Science & Technology(1)  Encyclopedia(1)  

Chemical element Definition from Language, Idioms & Slang Dictionaries & Glossaries

WordNet 2.0
chemical element
Noun
1. any of the more than 100 known substances (of which 92 occur naturally) that cannot be separated into simpler substances and that singly or in combination constitute all matter
(synonym) element
(hypernym) substance, matter
(hyponym) allotrope
(part-meronym) atom

hEnglish - advanced version
chemical element
chemical element
n : any of the more than 100 known substances (of which 92 occur naturally) that cannot be separated into simpler substances and that singly or in combination constitute all matter [syn: element]




Chemical element Definition from Society & Culture Dictionaries & Glossaries

EPA Terms of Environment
Chemical Element
A fundamental substance comprising one kind of atom; the simplest form of matter.

Environmental Engineering (English ver.)
Chemical Element
A fundamental substance comprising one kind of atom; the simplest form of matter.


Chemical element Definition from Science & Technology Dictionaries & Glossaries


Chemical element Definition from Encyclopedia Dictionaries & Glossaries

Wikipedia English - The Free Encyclopedia
Chemical element
A chemical element, or element, is a type of atom that is defined by its atomic number; that is, by the number of protons in its nucleus. The term is also used to refer to a pure chemical substance composed of atoms with the same number of protons.

Common examples of elements are hydrogen, nitrogen, and carbon. In total, 117 elements have been observed as of 2007, of which 94 occur naturally on Earth. Elements with atomic numbers greater than 82 (i.e,. bismuth and those above), are inherently unstable and undergo radioactive decay. In addition, elements 43 and 61 (technetium and promethium) have no stable isotopes, and also decay. However, even the elements up to atomic number 94 with no stable nuclei are nevertheless found in nature, as a result of the natural decay processes of uranium and thorium.


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