Multiple Choice
Which molecular geometry is expected for a molecule with the formula AX_2, where the central atom has two regions of high electron density (RHEDs) and no lone pairs?
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12. Molecular Shapes & Valence Bond Theory
Molecular Geometry
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What is the molecular geometry of methane (CH_4)?
A
Bent
B
Linear
C
Tetrahedral
D
Trigonal planar
Verified step by step guidance1
Identify the central atom in methane (CH_4), which is carbon (C).
Determine the number of valence electrons around the central atom. Carbon has 4 valence electrons, and each hydrogen contributes 1 electron, but we focus on the central atom's bonding.
Use the VSEPR (Valence Shell Electron Pair Repulsion) theory to predict the shape. Carbon forms 4 single bonds with hydrogen atoms, resulting in 4 bonding pairs and no lone pairs on the central atom.
According to VSEPR theory, 4 bonding pairs around a central atom arrange themselves as far apart as possible, which corresponds to a tetrahedral geometry.
Conclude that the molecular geometry of methane (CH_4) is tetrahedral, with bond angles approximately 109.5 degrees.
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