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Multiple Choice
Which of the following factors primarily determine the geometry of a molecule?
A
The number of electron domains () around the central atom
B
The boiling point of the molecule
C
The atomic mass of the central atom
D
The color of the molecule
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1
Understand that the geometry of a molecule is primarily determined by the arrangement of electron domains around the central atom. Electron domains include both bonding pairs (shared electrons in bonds) and lone pairs (non-bonding electrons).
Recall the Valence Shell Electron Pair Repulsion (VSEPR) theory, which states that electron domains repel each other and arrange themselves as far apart as possible to minimize repulsion, thus determining the molecular shape.
Identify the total number of electron domains around the central atom by counting all bonding pairs and lone pairs.
Use the number of electron domains to predict the electron domain geometry (e.g., linear, trigonal planar, tetrahedral, trigonal bipyramidal, octahedral).
Adjust the predicted geometry to account for lone pairs, which can alter the molecular shape from the ideal electron domain geometry, but the initial geometry is based on the total number of electron domains.