The noble gases rarely form compounds. They have the most stable configuration (octet/duplet), so they have no reason to react and change their configuration. All other elements attempt to gain, lose, or share electrons to achieve a noble gas configuration.
The octet rule refers to the tendency of atoms to prefer to have eight electrons in the valence shell. When atoms have fewer than eight electrons, they tend to transfer or share electrons and form more stable compounds.
But, for some atoms, even when they from stable configuration, it still do not achieve octet rule. Therefore, there are exception of octet rule for the central atom of molecule: incomplete octet, expanded octet and odd number electrons.
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