Is SiF4 a polar or nonpolar molecule?
Very much non-polar. while each Si-F bond is polar (polarized Si delta plus and F delta minus) the whole molecule is not polar as the tetrahedral arrangement of four Si-F cancel out the dipoles rendering the SiF4 of zero dipole.
Draw the correct Lewis structure of SF4. It has one lone pair and four bonds around sulfur. you now have the geometry for SF4, which is a "seesaw," a truncated trigonal bipyramid. SF4 has the two axial fluorines bent slightly back toward the other two fluorine atoms.
- For SF4 the difference in electronegativity (∆EN = 2.98) note that is > the 1.7; therefore it is indeed a polar molecule. Sulfur tetrafluoride ends up with 2 extra electons on the central atom, thus the SF4 molecule contains four covalent bonds and a non-bonded pair of electrons.
- Electrons shared in p orbitals are called pi bonds. A triple bond consists of one sigma bond and two pi bonds. The image shows how they are arranged between two nitrogen atoms. Together, the two dark green bands are one pi bond.
- This is because the Valence Shell Electron Pairs will Repel each other. When they do they are forced to the opposite side of the Carbon atom giving CO2 a linear molecular shape. The CO2 bond angle will be 180 degrees since it has a linear molecular geometry.
Sulfur tetrafluoride has 10 electrons around the central sulfur atom. This means there are five electron pairs arranged in an trigonal bipyramidal shape with 102° F-S-F bond angles between the equatorial fluorine atoms and 173° between the axial fluorine atoms.
- Water has 8 electrons around the central oxygen atom. This means there are four electron pairs arranged in a tetrahedral shape. There are two bonding pairs and two lone pairs. The resulting shape is bent with an H-O-H angle of 104.5°.
Seesaw molecular geometry Steric number 5 Coordination number 4 Bond angle(s) 90°, 120°, 180° μ (Polarity) >0
- You can find the hybridization of an atom by finding its steric number: The steric number = the number of atoms bonded to the atom + the number of lone pairs the atom has. If the steric number is 4, the atom is s p 3 hybridized. If the steric number is 3, the atom is s p 2 hybridized.
Updated: 23rd September 2018