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Nature of Chemical Bond

Chemical bond:

Chemical bond is the attractive force, which holds various constituents (such as atoms, ions) together in different chemical species.

 

Octet rule:

Atoms tend to gain, lose, or share electrons so as to have eight electrons in their valence shells.

 

Lewis dot Structure:

Representation of molecules and ions in terms of the shared pairs of electrons and the octet rule

 

CO32-

 

NO2-

 

HNO3

Formal charge:

Lewis structure of O3  

 

 

F.C. on the O-1 

F.C. on the O-2 

F.C. on the O-3

 

Limitations of the octet rule:

  • Incomplete octet of the central atom

E.g. BeH2, LiCl, BCl3

 

 

  • Odd electron molecules

E.g. NO, NO2

 

 

  • Expanded octet

E.g. PF5, SF6, H2SO4

 

 

 

  • Some other drawbacks:
  1. It is based upon chemical inertness of noble gases. However, some noble gases can co…

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