Li
1s2 2s1
O
1s2 2s2 2p4
Ar
1s2 2s2 2p6 3s2 3p6
OR Argon (looks like) [Ne] 3s2 3p6
http://www.chemistrytutorials.org/content/atomic-structure/electron-configuration
http://chemwiki.ucdavis.edu/Core/Inorganic_Chemistry/Electronic_Structure_of_Atoms_and_Molecules/Electronic_Configurations
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