The Octet Rule

A rule that states that all atoms want to be in the same state as noble gases, with a full outershell of electrons. Elements bond so that resulting compounds fulfil this rule of a full outershell.

However there are some exceptions:

1. molecules with an odd number of electrons

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

3. molecules in which has more than an octet

4. BERYLLIUM AND BORON → they have fever than 8 valence electrons available to bond (beryllium only has 2 valence electrons, only forming a maximum of two bonds and a full outer energy level of only 4 electrons).