QuestionApril 23, 2025

7. Write Lewis structures and determine the molecular geometries for the following molecules: 10 points a) PCl_(5) b) XeF_(2)

7. Write Lewis structures and determine the molecular geometries for the following molecules: 10 points a) PCl_(5) b) XeF_(2)
7. Write Lewis structures and determine the molecular geometries for the following molecules: 10 points a) PCl_(5) b) XeF_(2)

Solution
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Answer

a) PCl_{5}: Trigonal bipyramidal ### b) XeF_{2}: Linear Explanation 1. Draw Lewis Structure for PCl_{5} Phosphorus (P) has 5 valence electrons, and each Chlorine (Cl) has 7. Total valence electrons = 5 + 5 \times 7 = 40. P is central, surrounded by 5 Cl atoms with single bonds. 2. Determine Molecular Geometry for PCl_{5} With 5 bonding pairs and no lone pairs on P, the geometry is **trigonal bipyramidal**. 3. Draw Lewis Structure for XeF_{2} Xenon (Xe) has 8 valence electrons, and each Fluorine (F) has 7. Total valence electrons = 8 + 2 \times 7 = 22. Xe is central, bonded to 2 F atoms with single bonds, and 3 lone pairs remain on Xe. 4. Determine Molecular Geometry for XeF_{2} With 2 bonding pairs and 3 lone pairs on Xe, the geometry is **linear**.

Explanation

1. Draw Lewis Structure for $PCl_{5}$<br /> Phosphorus (P) has 5 valence electrons, and each Chlorine (Cl) has 7. Total valence electrons = $5 + 5 \times 7 = 40$. P is central, surrounded by 5 Cl atoms with single bonds.<br /><br />2. Determine Molecular Geometry for $PCl_{5}$<br /> With 5 bonding pairs and no lone pairs on P, the geometry is **trigonal bipyramidal**.<br /><br />3. Draw Lewis Structure for $XeF_{2}$<br /> Xenon (Xe) has 8 valence electrons, and each Fluorine (F) has 7. Total valence electrons = $8 + 2 \times 7 = 22$. Xe is central, bonded to 2 F atoms with single bonds, and 3 lone pairs remain on Xe.<br /><br />4. Determine Molecular Geometry for $XeF_{2}$<br /> With 2 bonding pairs and 3 lone pairs on Xe, the geometry is **linear**.
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