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VSEPR Theory-Applications part 1

VSEPR Theory

source : justinbechthold.wordpress.com

VSEPR Theory [Valence Shell Electron Pair Repulsion Theory] -Applications-

A) Shapes of molecules containing bond pairs only-

i) Shape of BeCl2 molecule-

           Be – atom is surrounded by two bond pair of electrons . Geometry of BeCl2 molecule is linear and bond angle is 180 0.

Other Ex.- BeF2 , ZnCl2 , HgCl2

source : Slide Share

ii)  Shape of BCl3 molecule-

               Valence shell of Boron has three valence electrons. So each electron of Boron form a bond pair with Cl – atom. Hence B- atom is surrounded by three bond pairs. Geometry of molecule is trigonal planar.

Other Ex.- BF3 , AlCl3

source : Study.com

iii)  Shape of CH4 molecule-

Valence shell of Carbon  has four valence electrons. So each electron of Carbon-atom form a bond pair with H – atom. Hence C- atom is surrounded by four bond pairs. Geometry of molecule is tetrahedral and bond angle is 109028′.

Other Ex.- SiF4 , CCl4 , SiH4, NH4+

source : revolvy.com

iv)  Shape of PCl5  molecule-

Phosphorus has five valence electrons . These five valence electrons are bonded by 5 Cl -atoms forming 5 bond pairs around the P – atom.So geometry is trigonal bipyramidal . In PCl5 all the bond angles are not equal. The three bond pairs are in the same plane at an angle of 1200, while other two bond pairs are perpendicular to the plane, making an angle of 900 with the plane.

Ex . – PF5

source : Lumen Learning

v)  Shape of SF6  molecule-

             Six valence electrons are present in central Sulphur atom . Each of these six forms bond with F – atom. Geometry of molecule is octahedral and all bond angles are same (900).

source : Lumen Learning

vi)  Shape of  IF7 molecule-

              Iodine  has seven  valence electrons . These seven  valence electrons are bonded by seven  F -atoms forming seven  bond pairs around the I – atom . So geometry is pentagonal bipyramidal . In  iodine hepta fluoride (IF7) all the bond angles are not equal. The five bond pairs are in the same plane at an angle of 720, while other two bond pairs are perpendicular to the plane, making an angle of 900 with the plane.

source : wikipedia

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