12. Molecular Shapes & Valence Bond Theory

Electron Geometry

VSEPR and Molecular Geometry

(b) An AB4 molecule has two lone pairs of electrons on the A atom (in addition to the four B atoms). What is the electron-domain geometry
around the A atom?

(a) An AB2 molecule is linear. How many nonbonding electron
pairs are around the A atom from this information?

VSEPR Theory

Electron geometry and bond angles - Real Chemistry

A series of anions is shown below:

The anion on the far right is called “BARF” by chemists, as
its common abbreviation sounds similar to this word.
(c) Which, if any, of these anions has an expanded octet 
around its central atom?

A series of anions is shown below:
<img src="https://lightcat-files.s3.amazonaws.com/problem_images/e16b354274912d28-1665572828276.jpg" alt="" />
The anion on the far right is called “BARF” by chemists, as
its common abbreviation sounds similar to this word.
(b) What is the electron-domain geometry around the 
central B in BARF?

What is the difference in spatial distribution between electrons in a p bond and electrons in a s bond?

a) Predict the electron-domain geometry around the central
S atom in SF2, SF4, and SF6.

A molecule with the formula AB3 has a trigonal planar geometry. 
How many electron groups are on the central atom?

How many charge clouds are there around the central atom in molecules that have the following geometry?
(a) Tetrahedral (b) Octahedral
(c) Bent (d) Linear
(e) Square pyramidal (f) Trigonal pyramidal

Electron Geometry Example 2

An AB2 molecule is described as having a tetrahedral geometry.
(a) How many nonbonding domains are on atom A?

Consider the following XF4 ions: PF4-, BrF4-, ClF4+, and AlF4-.
(c) Which of the ions will have an octahedral electron-domain geometry?

Determine the number of electron groups for the following cation:AsBr2+.&nbsp;A. 2B. 3C. 4D. 1

Would you expect the nonbonding electron-pair domain in 
NCl3 to be greater or smaller in size than the corresponding 
one in PCl3?

How many electron domains are surrounding the central 
atoms which adopt the following geometries? (d) trigonal bipyramidal.

VSEPR Theory and Molecular Geometry

Electron Geometry Example 1

The electron geometry&nbsp;of a compound treats surrounding elements and lone pairs on the central element as the same.

Determine the electron geometry of the nitrogen atom within methylamine, CH3NH2. &nbsp;<img class="fr-dib"src="https://static.studychannel.pearsonprd.tech/courses/general-chemistry/thumbnails/images/a0f78e10"style="width:172px;">A. LinearB. Trigonal PyramidalC. TetrahedralD. Trigonal Planar

Understanding Electronic Geometry

Consider the molecule PF4Cl. (d) Would you expect the molecule 
to distort from its ideal electron-domain geometry? If 
so, how would it distort?

A molecule with the formula AB3 has a trigonal pyramidal geometry.
How many electron groups are on the central atom (A)?

Draw and determine the electron geometry for the following molecule:TeBr4

An AB5 molecule adopts the geometry shown here. (c) Suppose the 
B atoms are halogen atoms. Of which group in the periodic 
table is atom A a member: (i) Group 15, (ii) Group 16, 
(iii) Group 17, (iv) Group 18, or (v) More information is 
needed? 
<img src="https://lightcat-files.s3.amazonaws.com/problem_images/5b62be185596ba41-1661270189033.jpg" alt="" />

Determine the electron geometry for the carbon disulfide molecule, CS2.&nbsp;<img class="fr-dib"src="https://static.studychannel.pearsonprd.tech/courses/general-chemistry/thumbnails/images/d4c196e0"style="width:158px;">A. LinearB. BentC. Trigonal planarD. Tetrahedral

How does a trigonal pyramid differ from a tetrahedron so far 
as molecular geometry is concerned?

Electron Geometry Concept 1

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1. Intro to General Chemistry

2. Atoms & Elements

3. Chemical Reactions

4. BONUS: Lab Techniques and Procedures

5. BONUS: Mathematical Operations and Functions

6. Chemical Quantities & Aqueous Reactions

7. Gases

8. Thermochemistry

9. Quantum Mechanics

10. Periodic Properties of the Elements

11. Bonding & Molecular Structure

13. Liquids, Solids & Intermolecular Forces

14. Solutions

15. Chemical Kinetics

16. Chemical Equilibrium

17. Acid and Base Equilibrium

18. Aqueous Equilibrium

19. Chemical Thermodynamics

20. Electrochemistry

21. Nuclear Chemistry

22. Organic Chemistry

23. Chemistry of the Nonmetals

24. Transition Metals and Coordination Compounds

[BOOK CHEM] Clutch Version

MO Theory: Homonuclear Diatomic Molecules

Homonuclear Diatomic Molecules are composed of 2 identical elements bonded together.

Equatorial and Axial Positions

Covalent compounds with 5 or 6&nbsp;electron groups have equatorial and axial positions for surrounding elements

MO Theory: Heteronuclear Diatomic Molecules

Heteronuclear Diatomic Molecules are composed of 2 different elements bonded together.

Bond Angles

Bond Angles&nbsp;result from surrounding elements and lone pairs around the central element positioning themselves at an optimal distance.&nbsp;

Molecular Orbital Theory

Molecular Orbital Theory&nbsp;allows us to predict the distribution of electrons within a molecule.&nbsp;

MO Theory: Bond Order

Molecular Orbital Diagrams can be used to determine the bond order of a molecule.

The simplest system for geometrical shapes that focuses on the number of electron groups around the central atom.

Hybridization

How would an&nbsp;s orbital combine with a p orbital to form a covalent bond? The answer is through hybridization where a hybrid&nbsp;oribital is formed.&nbsp;

Molecular Geometry

True Shape of Molecules that takes into account differences&nbsp;in repulsion between lone pairs and surrounding elements.

Valence Shell Electron Pair Repulsion Theory

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