Multiple Choice
What is the molecular geometry of CO_2?
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12. Molecular Shapes & Valence Bond Theory
Molecular Geometry
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Which molecular geometry best describes the compound H_2S?
A
Tetrahedral
B
Bent
C
Linear
D
Trigonal planar
Verified step by step guidance1
Identify the central atom in the molecule H\_2S, which is sulfur (S).
Determine the number of valence electrons around the central atom. Sulfur has 6 valence electrons, and each hydrogen contributes 1 electron, for a total of 8 electrons to consider.
Draw the Lewis structure of H\_2S: sulfur is bonded to two hydrogen atoms, and the remaining electrons form lone pairs on sulfur.
Count the number of bonding pairs and lone pairs around the sulfur atom. There are 2 bonding pairs (S-H bonds) and 2 lone pairs on sulfur.
Use the VSEPR (Valence Shell Electron Pair Repulsion) theory to predict the molecular geometry. With 2 bonding pairs and 2 lone pairs, the shape is bent (angular), not tetrahedral, linear, or trigonal planar.
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