Concept
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Electron Shells and the Bohr Model
![Bohr diagrams](../../../../../../../../../figures.boundless-cdn.com/18518/full/figure-02-01-06.jpg)
Bohr diagrams
Bohr diagrams indicate how many electrons fill each principal shell. Group 18 elements (helium, neon, and argon are shown) have a full outer, or valence, shell. A full valence shell is the most stable electron configuration. Elements in other groups have partially-filled valence shells and gain or lose electrons to achieve a stable electron configuration.
Source
Boundless vets and curates high-quality, openly licensed content from around the Internet. This particular resource used the following sources:
"OpenStax College, Atoms, Isotopes, Ions, and Molecules: The Building Blocks. October 16, 2013."
http://cnx.org/content/m44390/latest/Figure_02_01_06.png
OpenStax CNX
CC BY 3.0.