Nonbonding Electron Valence Shell Bonding Electron Аpprox. Bond Molecule or Lewis Electron VSEPR Geometric Molecular Ion Structure Pairs Pairs Pairs Formula Angle Shape 1. CH4 4 4 AX, 109.5° tetrahedral H H:C:H H 4. Complete the table (as outlined above) for the following molecules/molecular ions. For molecules or molecular ion with two or more atoms considered as central atoms, consider each atom separately in the analysis according to Tabl D3.3. Complete those that are assigned by your laboratory instructor. g. COCI, j. O3 k. NO3

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### Molecular Geometry and VSEPR Theory

The table below illustrates the application of Valence Shell Electron Pair Repulsion (VSEPR) theory to predict the geometry of a molecule based on its Lewis structure. For example, the methane molecule (CH₄) is analyzed as follows:

#### CH₄ (Methane)
- **Molecule or Molecular Ion:** CH₄
- **Lewis Structure:** 
  - The central carbon atom is bonded to four hydrogen atoms.
  - Electron dot diagram for CH₄ is:
    ```
       H
        |
    H - C - H
        |
       H
    ```
- **Valence Shell Electron Pairs:** 4
- **Bonding Electron Pairs:** 4
- **Nonbonding Electron Pairs:** 0
- **VSEPR Formula:** AX₄
- **Approx. Bond Angle:** 109.5°
- **Geometric Shape:** Tetrahedral

#### Assignment Exercise
Complete the table (as outlined above) for the following molecules/molecular ions. For molecules or molecular ions with two or more atoms considered as central atoms, consider each atom separately in the analysis according to Table D3.3. Complete those that are assigned by your laboratory instructor.

- g. COCl₂
- j. O₃
- k. NO₃⁻

### Notes
1. When building Lewis structures, ensure that the correct number of valence electrons is represented, and that the octet rule is followed where applicable.
2. Use VSEPR theory to determine the shape of the molecule by considering bonding pairs and lone pairs of electrons around the central atom.
3. The VSEPR formula notation specifies the number of bonding pairs (X) and lone pairs (E) around the central atom. For example, AX₄ indicates four bonding pairs and no lone pairs.
4. The approximate bond angles are critical in determining the molecular shape, leading to the prediction of whether the shape is linear, trigonal planar, tetrahedral, etc.

By following this methodology, you can predict the shapes and angles of other molecules and molecular ions, aiding in the understanding of their chemical behavior and interactions.
Transcribed Image Text:### Molecular Geometry and VSEPR Theory The table below illustrates the application of Valence Shell Electron Pair Repulsion (VSEPR) theory to predict the geometry of a molecule based on its Lewis structure. For example, the methane molecule (CH₄) is analyzed as follows: #### CH₄ (Methane) - **Molecule or Molecular Ion:** CH₄ - **Lewis Structure:** - The central carbon atom is bonded to four hydrogen atoms. - Electron dot diagram for CH₄ is: ``` H | H - C - H | H ``` - **Valence Shell Electron Pairs:** 4 - **Bonding Electron Pairs:** 4 - **Nonbonding Electron Pairs:** 0 - **VSEPR Formula:** AX₄ - **Approx. Bond Angle:** 109.5° - **Geometric Shape:** Tetrahedral #### Assignment Exercise Complete the table (as outlined above) for the following molecules/molecular ions. For molecules or molecular ions with two or more atoms considered as central atoms, consider each atom separately in the analysis according to Table D3.3. Complete those that are assigned by your laboratory instructor. - g. COCl₂ - j. O₃ - k. NO₃⁻ ### Notes 1. When building Lewis structures, ensure that the correct number of valence electrons is represented, and that the octet rule is followed where applicable. 2. Use VSEPR theory to determine the shape of the molecule by considering bonding pairs and lone pairs of electrons around the central atom. 3. The VSEPR formula notation specifies the number of bonding pairs (X) and lone pairs (E) around the central atom. For example, AX₄ indicates four bonding pairs and no lone pairs. 4. The approximate bond angles are critical in determining the molecular shape, leading to the prediction of whether the shape is linear, trigonal planar, tetrahedral, etc. By following this methodology, you can predict the shapes and angles of other molecules and molecular ions, aiding in the understanding of their chemical behavior and interactions.
## Table D3.3 VSEPR and Geometric Shapes of Molecules and Molecular Ions

#### Overview:
This table presents valuable information on the Valence Shell Electron Pair Repulsion (VSEPR) theory, which helps predict the geometry of individual molecules based on the number of electron pairs surrounding their central atoms. Each entry in the table specifies the number of bonding and nonbonding electron pairs, the corresponding VSEPR formula, the three-dimensional structure, bond angles, geometric shapes, and examples of the molecules.

### Table Columns and Description:

1. **Valence Shell Electron Pairs:**
   - This column lists the total number of electron pairs in the valence shell of the central atom.

2. **Bonding Electron Pairs:**
   - The number of electron pairs involved in bonding with adjacent atoms.

3. **Nonbonding Electron Pairs:**
   - The number of lone electron pairs on the central atom.

4. **VSEPR Formula:**
   - A notation representing the number of bonding and nonbonding pairs. (A: Central atom, X: Bonded atoms, E: Lone pairs)

5. **Three-Dimensional Structure:**
   - Diagrams illustrating the spatial arrangement of atoms and electron pairs around the central atom.

6. **Bond Angle:**
   - The angle between the bonding pairs of electrons.

7. **Geometric Shape:**
   - The geometry described based on the arrangement of bonding pairs and lone pairs around the central atom.

8. **Examples:**
   - Examples of molecules or ions that exhibit the corresponding geometric shapes.

### Detailed Breakdown:

| Valence Shell Electron Pairs | Bonding Electron Pairs | Nonbonding Electron Pairs | VSEPR Formula | Three-Dimensional Structure | Bond Angle | Geometric Shape       | Examples             |
|------------------------------|------------------------|---------------------------|---------------|-----------------------------|------------|-----------------------|----------------------|
| 2                            | 2                      | 0                         | AX₂           | ::A::                       | 180°       | Linear                | HgCl₂, BeCl₂         |
| 3                            | 3                      | 0                         | AX₃           |   ::A::                     | 120°       | Planar triangular     | BF₃, In(CH₃)₃        |
| 3                            | 2                      | 1                         | AX₂E          |
Transcribed Image Text:## Table D3.3 VSEPR and Geometric Shapes of Molecules and Molecular Ions #### Overview: This table presents valuable information on the Valence Shell Electron Pair Repulsion (VSEPR) theory, which helps predict the geometry of individual molecules based on the number of electron pairs surrounding their central atoms. Each entry in the table specifies the number of bonding and nonbonding electron pairs, the corresponding VSEPR formula, the three-dimensional structure, bond angles, geometric shapes, and examples of the molecules. ### Table Columns and Description: 1. **Valence Shell Electron Pairs:** - This column lists the total number of electron pairs in the valence shell of the central atom. 2. **Bonding Electron Pairs:** - The number of electron pairs involved in bonding with adjacent atoms. 3. **Nonbonding Electron Pairs:** - The number of lone electron pairs on the central atom. 4. **VSEPR Formula:** - A notation representing the number of bonding and nonbonding pairs. (A: Central atom, X: Bonded atoms, E: Lone pairs) 5. **Three-Dimensional Structure:** - Diagrams illustrating the spatial arrangement of atoms and electron pairs around the central atom. 6. **Bond Angle:** - The angle between the bonding pairs of electrons. 7. **Geometric Shape:** - The geometry described based on the arrangement of bonding pairs and lone pairs around the central atom. 8. **Examples:** - Examples of molecules or ions that exhibit the corresponding geometric shapes. ### Detailed Breakdown: | Valence Shell Electron Pairs | Bonding Electron Pairs | Nonbonding Electron Pairs | VSEPR Formula | Three-Dimensional Structure | Bond Angle | Geometric Shape | Examples | |------------------------------|------------------------|---------------------------|---------------|-----------------------------|------------|-----------------------|----------------------| | 2 | 2 | 0 | AX₂ | ::A:: | 180° | Linear | HgCl₂, BeCl₂ | | 3 | 3 | 0 | AX₃ | ::A:: | 120° | Planar triangular | BF₃, In(CH₃)₃ | | 3 | 2 | 1 | AX₂E |
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