Multiple Choice
In the molecule carbon dioxide (CO_2), how many electron domains are present around the central carbon atom?
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12. Molecular Shapes & Valence Bond Theory
Molecular Geometry
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Join thousands of students who trust us to help them ace their exams!Watch the first videoMultiple Choice
Which of the following best describes the molecular geometry of a water (H2O) molecule?
A
Tetrahedral
B
Trigonal planar
C
Linear
D
Bent
Verified step by step guidance1
Identify the central atom in the water molecule, 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 oxygen 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 that because of the two lone pairs, the molecular geometry is 'bent' rather than tetrahedral, trigonal planar, or linear.
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