In chemistry and atomic physics, an electron shell, also called a principal energy level may be thought of as an orbit followed by electrons around an atom`s nucleus. The closest shell to the nucleus is called the `{serif|1} shell` (also called `K shell`), followed by the `{serif|2} shell` (or `L shell`), then the `{serif|3} shell` (or ...
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http://en.wikipedia.org/wiki/Electron_shell
(from the article `atom`) In the quantum mechanical version of the Bohr atomic model, each of the allowed electron orbits is assigned a quantum number that runs from 1 (for ... ...the arrangement of electrons in atoms in the following section. The key to understanding the structure of the periodic table and hence the pattern ... Sod...
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http://www.britannica.com/eb/a-z/e/20
[
n] - a grouping of electrons surrounding the nucleus of an atom
Found on
http://www.webdictionary.co.uk/definition.php?query=electron%20shell
noun a grouping of electrons surrounding the nucleus of an atom; `the chemical properties of an atom are determined by the outermost electron shell`
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https://www.encyclo.co.uk/local/20974
A characteristic energy level with which an electron is associated. Electrons occupy discrete shells within the cloud surrounding an atom
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https://www.encyclo.co.uk/local/22327
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