what is the orderresonance, octet rule, bonds, etc... in deciding the stability of a compound???

@ satyam 
Besically , what u need to understand is that if any perticular compound cannot be represented by the lewis dot structure , in that case more than 1 lewis dot structure will represent that compound , and from that 1 of the structure will be their which properties are simmilar to that of the original compound . 
Then . that structure we call as resonance , as it represent the properties of molecule as a whole and intermediate of the lewis dot structure . 
MORE THE RESONANCE , MORE WILL BE THE STABILITY OF THE COMPOUND , DUE TO RESONANCE ENERGY . 
AND OCTECT RULE – IF ANY COMPOUND WILL FULFILL ITS OCTECT RULE , THEN THAT WILL BE MORE STABLE THAN THOSE WHICH DONOT . 
BONDS – THE HIGHER THE NO OF BONDS , THE MORE WILL BE THE STABILITY OF COMPOUND . 
FOR THAT REASON , AS THE BOND ORDER INCREASE , THEN THE STABILITY WILL INCREASE . 
hope it clears your doubt 
all the best ..