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(1)

2. 2. What is the meaning of VSEPR? What is the meaning of VSEPR?

The corresponding concept is a good tool for ...

The corresponding concept is a good tool for ...

and was established by...?

and was established by...?

Valence Shell Electron Pair Repulsion Concept

Predicting the shape/structure of molecules

It was established by Gillespie and Nyholm in the year 1957.

(2)

3. 3. Give the shape, the type, and the Give the shape, the type, and the psi- psi -polyhedron/ polyhedron/

geometry of CO

geometry of CO

2 2

, NO , NO

2 2--

, NO , NO

3 3--

, SO , SO

3 322--

,XeF ,XeF

4 4

, , PCl PCl

5 5

(g), SF (g), SF

4 4

. .

For a molecule AX

m

E

n

(A = central atom, X = ligand atom, E = free electron pair ), X and E tend to minimize

repulsion i.e., are arranged on the surface of a sphere

around A forming simple polyhedra/geometric figures

(E needs more space than X).

(3)

Molecule Type Ψ-Geometry Geometry

CO

2

AX

2

linear linear

NO

2-

AX

2

E trig. pl. bent

NO

3-

AX

3

trig. pl. trig. pl.

(4)

Molecule Type Ψ-Geometry Geometry

SO

32-

AX

3

E tetr. trig. py.

XeF

4

AX

4

E

2

oct. quad. pl.

PCl

5

(g) AX

5

trig. bipy. trig. bipy

(5)

Molecule Type Ψ-Geometry Geometry SF

4

AX

4

E trig. bipy. disphenoidal

For further information see www.shef.ac.uk/chemistry/vsepr

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