# Step-by-Step Solution ## 1. Understanding the Question You are given a generic molecule with a three-dimensional structure and asked to: - Identify the **axial** and **equatorial** positions (atoms) in this structure. - Determine the **shape** of the molecule. Since the molecule's actual structure/image is not provided, I will explain the concepts using the **trigonal bipyramidal** geometry, which is the context where "axial" and "equatorial" terms are most commonly used. --- ## 2. Axial and Equatorial Positions Explained ### Trigonal Bipyramidal Geometry - **Central Atom:** Surrounded by **five** atoms or groups. - **Bond Angles:** - **Equatorial positions:** 120° apart (in one plane). - **Axial positions:** 90° to the equatorial plane and 180° from each other. #### Structure Diagram ``` X (axial) | X—A—X (equatorial) | X (axial) ``` - **A:** Central atom - **X:** Surrounding atoms ### Definitions - **Axial Atoms:** Located above and below the central atom, aligned vertically. - **Equatorial Atoms:** Arranged in a horizontal triangle around the central atom. --- ## 3. Identifying Axial and Equatorial Atoms - **Axial Atoms:** 2 out of 5; form a straight line through the central atom (180° apart). - **Equatorial Atoms:** 3 out of 5; form a triangle in a plane (120° apart). **Example:** If atoms are labeled as 1 to 5: - Atoms 1 and 4 are axial (vertical line). - Atoms 2, 3, and 5 are equatorial (horizontal triangle). --- ## 4. Shape of the Molecule - When a molecule has **five regions of electron density** (five atoms/groups bonded to a central atom and no lone pairs), its **shape is called**: **Trigonal Bipyramidal** --- ## 5. Final Answers ### **Shape of the molecule:** **Trigonal Bipyramidal** ### **Axial Atoms:** The two atoms that are 180° apart, positioned above and below the central atom. ### **Equatorial Atoms:** The three atoms arranged 120° apart in one plane around the central atom. --- ## Summary Table | Position | Number of Atoms | Angle(s) | Location | |-------------|-----------------|---------------|-------------------------| | Axial | 2 | 180° (to each other), 90° (to equatorial) | Above and below the central atom | | Equatorial | 3 | 120° (to each other) | In a plane (triangle) around the central atom | --- ## **Illustration** **(For reference)**  *Alt text: Trigonal bipyramidal structure with two axial positions (vertical) and three equatorial positions (horizontal triangle)* --- ### **If you provide the specific molecule or an image, the exact atoms can be labeled accordingly.**