"The octet rule is a simple chemical rule of thumb that states that atoms tend to combine in such a way that they each have eight electrons in their valence shells, giving them the same electronic configuration as a noble gas." Also, the octet rule is a way to predict what kind of ion an atom will form.
http://www.800mainstreet.com/4/0004-005-ion-octet.html & http://en.wikipedia.org/wiki/Octet_rule
"The Bohr model despicts the atom as a small, positively charged nucleus surrounded by electrons that travel in circular orbits around the nucleus—similar in structure to the solar system, but with electrostatic forces providing attraction, rather than gravity." The Bohr model was devised by Niels Bohr. The model isn't very accurate, but very useful in today's experiments.
http://en.wikipedia.org/wiki/Bohr_model
Lewis structures are diagramms which show the bonding of atoms of an molecule with the ione pairs of electrions that may or may not exist. The Lewis structure may also be called the Lewis Dot Diagrams, electron dot diagrams, and electron dot structures.
http://en.wikipedia.org/wiki/Lewis_dot_diagram
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