Multiple Choice
When drawing the Lewis structure for SF_4, what is the hybridization of the central sulfur atom and its formal charge?
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11. Bonding & Molecular Structure
Lewis Dot Structures: Exceptions
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After drawing the Lewis structure of AsF_5, what is the ideal F–As–F bond angle around the central arsenic atom?
A
109.5°
B
90° and 120°
C
104.5°
D
180°
Verified step by step guidance1
Identify the central atom and its bonding: In AsF_5, arsenic (As) is the central atom bonded to five fluorine (F) atoms.
Draw the Lewis structure: Arsenic has 5 valence electrons and each fluorine has 7 valence electrons. Arsenic forms five single bonds with fluorine atoms, using all its valence electrons with no lone pairs left on arsenic.
Determine the electron domain geometry: With five bonding pairs and no lone pairs on the central atom, the electron domain geometry is trigonal bipyramidal.
Recall the ideal bond angles for trigonal bipyramidal geometry: The bond angles are 90° between axial and equatorial positions, and 120° between equatorial positions.
Conclude the ideal F–As–F bond angles: Therefore, the ideal bond angles around arsenic in AsF_5 are 90° and 120°.
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