What is the electronic geometry of H2O? Enter the electronic geometry of the molecule. What is the electronic of ClF3 ? Enter the electronic geometry of the molecule. What is the electronic geometry of BBr3 ? Enter the electronic geometry of the molecule.

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Valence Shell Electron Pair Repulsion (VSEPR) Theory

oIn Valance Shell Electron Pair Repulsion (VSPER) theory, the electrons that surround the central atom of molecule are arranged in such a way that they minimize the electron-electron repulsions.

oThis arrangement of electrons can be used to predict the geometrical shape of polyatomic molecules by calculating the bond pair and lone pair of electrons surrounding the central atom/ions.


The molecular shape of various molecules having specific number of lone pair of electrons and bonding pair of electrons are given below:

Number of bonding groups on central atom

Number of lone pairs on central atom

Molecular notation

Electron-pair geometry

Molecular geometry

2

0

*

linear

Linear

3

0

*

trigonal planar

trigonal planar

2

1

*

trigonal planar

bent

4

0

*

tetrahedral

tetrahedral

5

0

*

trigonal bipyramidal

trigonal bipyramidal

3

2

*

trigonal bipyramidal

T-shape

4

1

*

trigonal bipyramidal

seesaw

4

2

*

octahedral

square planar

The geometrical shape of molecules which can be identified by calculating the number of bond pair and lone pair of electrons and steps involved in the calculation is given below:

Step.1: Write the electron dot formula from the given molecular formula.

Step.2: Determine the total number of bonding pair electrons and lone pair of electrons that present around the central atom.

Step.3: Determine the arrangement of these electron pairs around the central atom to find the electron geometry.


(b)

The electron dot structure of

*
is given below:

*

The total number of bond pair of electrons = 2.

The total number of lone pair of electrons = 2.

Therefore, the electron geometry of molecule is “tetrahedral.”

(c)

The electron dot structure of

*
is given below:

*

The total number of bond pair of electrons = 3.

The total number of lone pair of electrons = 2.

Therefore, the electron geometry of molecule is “trigonal bipyramidal.”

(d)

The electron dot structure of

*
is given below:

*

The total number of bond pair of electrons = 3.

The total number of lone pair of electrons = 0.

Therefore, the electron geometry of molecule is “trigonal planar.”

Ans: Part b

The electron geometry of

*
is given below:

*

Part c

The electron geometry of

*
is given below:
*

Part d

The electron geometry of

*
is given below:
*


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