The reason is that the lone pair prefers one of the equatorial positions. :F: :T: -Si- :: :F: 90° And 180° All Are 90° All Are 109.5° 90° And 109.5° 2 / 10 2 1 Point Draw Lewis Structures (the Central Atom Is Underlined) In Order To Rank The Species In Order Of Increasing Bond Angle. Bonding electron pairs have fewer repulsions as compared to lone pair electrons. Question: Module 14 Quiz 1 1 Point Given The Lewis Structure Of SiF4 Below, What Are The Bond Angles In The Molecule? 4th ed. Volumes 1: New York, NY. John Wiley and Sons, 1991-Present., p. Silicon & boron burn in fluorine forming SiF4 & BF3, respectively Kirk-Othmer Encyclopedia of Chemical Technology. The shape is like a seesaw. Hence the bond angle is maximum i.e. Hence the bond angle will be medium in this case. Here, SF4 bond angles are around 102 degrees in the equatorial plane and around 173 degrees between the axial and equatorial positions. The bond angle is least affected in case of SiF 4, since all the Si-F bonds are single bonds, which exert less repulsion on other bond pairs. 109 o 28' In POF 3, there is a double bond between P and O, which also causes more repulsion than single bond, but less than the triple bond. Homework:

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