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Octet Rule

Noble gases are very stable as their outermost shell is completely full, it has 8 electrons that are paired.

 

Atoms 'want' to be in this stable state; this is the 'Octet Rule'

 

When elements bond so that the resulting compound has a full outer shell of paired electrons they are said to obey the 'octet rule'.

 

There are exceptions to the Octet Rule:

 

  1. Molecules with an odd number of electrons

  2. Molecules in which an atom has less than an octet

  3. Molecules in which an atom has more than an octet