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octet rule

   Also found in: Wikipedia, Hutchinson 0.03 sec.
octet rule [äk‚tet ‚rül]
(chemistry)
A concept of chemical bonding theory based on the assumption that in the formation of compounds, atoms exhibit a tendency for their valence shells either to be empty or to have a full complement of eight electrons (octet); for some elements there are more than the usual eight valence electrons in some of their compounds.


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In the 1930s, Linus Pauling developed the valence bond (VB) theory, reformulating the octet rule according to quantum mechanical principles.
 
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