Multiple Choice
What is the molecular geometry of BrF_5?
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12. Molecular Shapes & Valence Bond Theory
Molecular Geometry
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Which of the following best describes the molecular geometry of H_2O?
A
Bent
B
Linear
C
Trigonal planar
D
Tetrahedral
Verified step by step guidance1
Identify the central atom in the molecule H\_2O, which is oxygen (O).
Determine the number of electron groups around the central atom. Oxygen has two bonded hydrogen atoms and two lone pairs, making a total of four electron groups.
Use the VSEPR (Valence Shell Electron Pair Repulsion) theory to predict the electron geometry. Four electron groups around the central atom correspond to a tetrahedral electron geometry.
Consider the effect of lone pairs on molecular shape. Lone pairs occupy space and repel bonded atoms, causing the shape to deviate from perfect tetrahedral.
Conclude the molecular geometry by focusing on the positions of the atoms only (ignoring lone pairs). With two bonded atoms and two lone pairs, the molecular geometry is bent (or angular).
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