We’re being asked to **determine the electron pair and molecular geometry** of **PCl _{4}^{–}**.

The possible electron pair and molecular geometries are:

To do so, we first need to draw a **Lewis structure for PCl _{4}^{–}**.

**For this, we need to do the following steps:**

*Step 1:* Determine the central atom in this molecule.

*Step 2:* Calculate the total number of valence electrons present.

*Step 3:* Draw the Lewis structure for the molecule.

*Step 4:* Determine the electron pair geometry of the molecule.

*Step 5:* Determine the molecular geometry of the molecule.

Consider the polyatomic ion PCl _{4}^{-} and its three dimensional structure. What is the electronic geometry and the molecular geometry for this ion?

1. tetrahedral; tetrahedral

2. trigonal bypyramidal; tetrahedral

3. octahedral; square planar

4. octahedral; square pyramidal

5. trigonal bipyramidal; T-shaped

6. trigonal bipyramidal; seesaw

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Based on our data, we think this problem is relevant for Professor O'Connor's class at MEMPHIS.