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please teach valence bond theory in detail.

Asked by Komal Vaishnav 24th February 2015, 6:06 PM
Answered by Expert
Answer:

Hi,

  1. Valence bond theory was put forward by Heitler and London. According to this theory, during formation of bond between atoms, only the valence electrons from each bonded atom lose their identity. The other electrons remain unaffected and the formation of bond is accompanied by release of energy.
  2. The overlapping of orbitals results in the pairing of electrons.
  3. The greater the extent of overlapping, the stronger is the bond formed.
  4. The process of intermixing of the orbitals of slightly different energies so as to redistribute their energies resulting in the formation of new set of orbitals of equivalent energies and shape is called hybridization.
  1. Atomic orbitals used in different types of hybridization

Shapes of molecules/ions

Hybridisation type

Atomic orbitals

Examples

Linear

sp

one s + one p

BeCl2

Trigonal planar

sp2

one s + two p

BCl3

Tetrahedral

sp3

one s + three p

CH4,NH3

Square planar

 

   dsp2

 

one d +one s +two p

[Ni(CN)4]2-

[Pt(Cl)4] 2-

Trigonal bipyramidal

sp3d

one s+ three p + one d

PF5,PCl5

Square pyramidal

sp3d2

one s +three p +two d

BrF5

Octahedral

sp3d2

d2sp3

one s +three p +two d

two d + one s +three p

SF6,[CrF6]3- ,

[Co(NH3)6]3+

Answered by Expert 24th February 2015, 6:48 PM
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