Multiple Choice
According to Valence Shell Electron Pair Repulsion (VSEPR) Theory, what is the steric number for selenium dichloride (SeCl_2)?
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12. Molecular Shapes & Valence Bond Theory
Valence Shell Electron Pair Repulsion Theory
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According to Valence Shell Electron Pair Repulsion (VSEPR) Theory, what is the molecular geometry of a molecule with two regions of electron density around the central atom?
A
Bent
B
Trigonal planar
C
Linear
D
Tetrahedral
Verified step by step guidance1
Identify the number of regions of electron density around the central atom. In this problem, there are two regions of electron density.
Recall that according to VSEPR theory, the molecular geometry depends on the number of electron density regions (bonding and lone pairs) around the central atom.
For two regions of electron density, the electron pairs will arrange themselves as far apart as possible to minimize repulsion, which corresponds to a 180° angle between them.
This arrangement leads to a molecular geometry called 'Linear', where the atoms are arranged in a straight line.
Therefore, the molecular geometry of a molecule with two regions of electron density around the central atom is Linear.
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