QQuestionChemistry
QuestionChemistry
Determine the electron-domain geometry and molecular geometry for each of the following:
a. SBr₂
b. PI₄⁺
c. IBr₂⁻
The following three compounds all have the same general formula, XF₄. Compare the electron-domain geometries of these three compounds and explain what characteristic(s) of the central atom causes differences in geometry.
a. SiF₄
b. SeF₄
c. XeF₄
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Answer
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Step 1:I'll solve this problem step by step, following the specified LaTeX formatting guidelines:
Part 1: Electron-Domain and Molecular Geometries
Step 2:: SBr₂ Analysis
- Valence electrons: $$6 + (2 \times 7) = 20$$ electrons
- Central atom: S - Electron domain count: 3 domains (2 S-Br bonds, 1 lone pair) - Electron-domain geometry: Trigonal planar - Molecular geometry: Bent - Lone pair causes deviation from linear geometry
Step 3:: PI₄⁺ Analysis
- Valence electrons: $$5 + (4 \times 7) - 1 = 32$$ electrons
- Central atom: P - Electron domain count: 4 domains (4 P-I bonds, no lone pairs) - Electron-domain geometry: Tetrahedral - Molecular geometry: Tetrahedral
Step 4:: IBr₂⁻ Analysis
- Valence electrons: $$7 + (2 \times 7) + 1 = 22$$ electrons
- Central atom: I - Electron domain count: 3 domains (2 I-Br bonds, 1 lone pair) - Electron-domain geometry: Trigonal planar - Molecular geometry: Linear Part 2: XF₄ Compounds Comparison
Step 5:: Structural Characteristics
- All compounds have general formula XF₄ - Differences arise from central atom's electron configuration
Step 6:: SiF₄
- Si: Group 14, $$4s^{2}4p^{0}
- No lone pairs - Electron-domain geometry: Tetrahedral - Molecular geometry: Tetrahedral
Step 7:: SeF₄
- Se: Group 16, $$4s^{2}4p^{4}
- 1 lone pair on central atom - Electron-domain geometry: Trigonal bipyramidal - Molecular geometry: See-saw
Step 8:: XeF₄
- Xe: Group 18, $$5s^{2}5p^{6}
- 2 lone pairs on central atom - Electron-domain geometry: Octahedral - Molecular geometry: Square planar Final Explanation: The differences in geometry result from:
Step 9:
Varying number of valence electrons
Step 10:
Presence of lone pairs
Step 11:
Electron configuration of central atom
Final Answer
- SBr₂: Trigonal planar (electron-domain), Bent (molecular) - PI₄⁺: Tetrahedral (both electron-domain and molecular) - IBr₂⁻: Trigonal planar (electron-domain), Linear (molecular) - XF₄ Compounds: Varying geometries based on central atom's electron configuration
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