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