Question 10.2: Predicting Molecular Geometries Predict the geometry and bon...
Predicting Molecular Geometries
Predict the geometry and bond angles of PCl_{3}.
PCl_{3} has 26 valence electrons.
:\overset{..}{\underset{..}{Cl}}-\overset{:\overset{..}{\underset{\mid }{Cl}} :}{\underset{..}{P}}- \overset{..}{\underset{..}{Cl}:}The central atom (P) has four electron groups.
Three of the four electron groups around P are bonding groups and one is a lone pair.
The electron geometry is tetrahedral (four electron groups), and the molecular geometry—the shape of the molecule—is trigonal pyramidal (three bonding groups and one lone pair). Because of the presence of a lone pair, the bond angles are less than 109.5°.
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