The octet rule is just a rule of thumb stating that molecules "like" to have 8 electrons in their valence shell. This would give them the same structure as a noble gas. The easiest way to see this is lewis dot structures (see left). As you can see in the diagram, the nitrogen, N, has 5 electrons in it's valence shell. The Flourines, F, have 7. Each wants 8 electrons, so they all bond to form an 8 electron alliance with each other. With these bonds, it will be hard to break the bonds. That is the octet rule.
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