Multiple Choice
According to Valence Shell Electron Pair Repulsion (VSEPR) theory, what does the theory primarily predict for molecules?
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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 steric number for BF_3?
A
6
B
3
C
2
D
4
Verified step by step guidance1
Identify the central atom in the molecule BF_3, which is boron (B).
Determine the number of atoms directly bonded to the central atom. In BF_3, boron is bonded to three fluorine atoms.
Count the number of lone pairs of electrons on the central atom. Boron in BF_3 has no lone pairs because it forms three single bonds and has an incomplete octet.
Calculate the steric number using the formula: \(\text{Steric Number} = \text{Number of bonded atoms} + \text{Number of lone pairs on central atom}\).
Apply the values: \(\text{Steric Number} = 3 + 0 = 3\). This steric number corresponds to the electron pair geometry around the central atom.
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