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A Lewis structure that violates the octet rule would be one where a central atom doesn't have an octet of electrons, but has less or more than eight electrons around it. Examples include molecules with an odd number of valence electrons, such as NO or radicals like NO2.
A synonym for Lewis diagram is Lewis structure. It is a schematic representation of the bonding between atoms in a molecule and the arrangement of valence electrons around atoms.
nitrogen chlorine
Mg2+
The hexafluorosilicate ion, SiF6^2-, has a total of 48 valence electrons available for constructing its Lewis structure.
Lewis structure formulas are flat graphical formulas which do not contain any 3D information. A line in a Lewis structure represents a single bond formed between two electrons, while a pair of dots can be used to show a bonding pair or a pair of non-bonding electrons.