WERNER’S THEORY
In 1893 Werner produced a theory of coordination compound to explain the structure  and formation of compound.Werner was the first inorganic chemist to be awarded Nobel prize for chemistry in1913Werner postulated that metal exhibits two type of valancies i.e.                                           (1)Primary valancy and                                           (2)Secondary valancy Primary valency:The ligands which satisfy primary valency always ionic in nature.Primary valency is ionizable and non […]
  • In 1893 Werner produced a theory of coordination compound to explain the structure  and formation of compound.
  • Werner was the first inorganic chemist to be awarded Nobel prize for chemistry in1913
  • Werner postulated that metal exhibits two type of valancies i.e. 
                                          (1)Primary valancy and 
                                          (2)Secondary valancy 

Primary valency:

  • The ligands which satisfy primary valency always ionic in nature.
  • Primary valency is ionizable and non directional.
  • Primary valency only satisfied by negative ions i.e. anions and are written outside the coordination sphere.
  • Primary valency donot decide geometry of the coordination compound.
  • Primary valency corresponds to the oxidation state of the metal ion.
  • Primary valency is represented by dotted line i.e.(..........)

Secondary valency:

  • The ligands which satisfy secondary valency always covalent in nature.
  • Secondary valency is non ionizable and directional.
  • Secondary valency is satisfied by either neutral or negative or both type of ligands.
  • Secondary valency decide geometry of the complex 
  • Secondary valency corresponds to the coordination number of the metal ion.
  • Secondary valency is represented by solid line.

Question for you:

      In [Co(NH3)4Cl2]Cl   chlorine ligand satisfies which type of valency.

  

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