Lewis Vsepr
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- Words: 194
- Pages: 6
1.
Write a Lewis structure for N2, NH3, NO2-, NO3-,
S2, SO2, SO3, SO32- and mark those which are not necessarily resonance strucures/hybrids. → Octett rule, hypervalence, formal charges
* No other resonance structure
•
What is the meaning of VSEPR? The corresponding concept is a good tool for ... 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.
•
Give the shape, the type, and the psi-polyhedron/ geometry of CO2, NO2-, NO3-, SO32-,XeF4, PCl5(g), SF4.
For a molecule AXmEn (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).
Molecule
Type
Ψ-Geometry
Geometry
CO2
AX2
linear
linear
NO2-
AX2E
trig. pl.
bent
NO3-
AX3
trig. pl.
trig. pl.
Molecule
Type
Ψ-Geometry
Geometry
SO32-
AX3E
tetr.
trig. py.
XeF4
AX4E2
oct.
quad. pl.
PCl5 (g)
AX5
trig. bipy.
trig. bipy
Molecule
Type
Ψ-Geometry
Geometry
SF4
AX4E
trig. bipy.
disphenoidal
For further information see www.shef.ac.uk/chemistry/vsepr
Write a Lewis structure for N2, NH3, NO2-, NO3-,
S2, SO2, SO3, SO32- and mark those which are not necessarily resonance strucures/hybrids. → Octett rule, hypervalence, formal charges
* No other resonance structure
•
What is the meaning of VSEPR? The corresponding concept is a good tool for ... 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.
•
Give the shape, the type, and the psi-polyhedron/ geometry of CO2, NO2-, NO3-, SO32-,XeF4, PCl5(g), SF4.
For a molecule AXmEn (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).
Molecule
Type
Ψ-Geometry
Geometry
CO2
AX2
linear
linear
NO2-
AX2E
trig. pl.
bent
NO3-
AX3
trig. pl.
trig. pl.
Molecule
Type
Ψ-Geometry
Geometry
SO32-
AX3E
tetr.
trig. py.
XeF4
AX4E2
oct.
quad. pl.
PCl5 (g)
AX5
trig. bipy.
trig. bipy
Molecule
Type
Ψ-Geometry
Geometry
SF4
AX4E
trig. bipy.
disphenoidal
For further information see www.shef.ac.uk/chemistry/vsepr
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