(Polar molecules, Non-polar molecules, etc.)
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SF4 is polar because being polar means that it has an unequal distribution of electrons in it's structure. Because of the seesaw shape, it indicates that there are 4 bonded pairs as well as 1 lone pair of electrons. Because of the 1 lone pair of electrons around the central atom, it is characterized as polar since it is more electronegative with the lone pair of electrons, and it shows how unsymmetrical it is.
If the polar bonds in the following shapes are identical, with the same atoms connected to the central atom, then the molecule will be non-polar: linear, trigonal planar, tetrahedral, trigonal bipyramidal, and octahedral. This is because the atoms will be arranged symmetrically around the central atom due to the fact that there will be no lone pairs present on the central atom. Therefore, the dipoles will cancel.
Since the S--F bond has a dipole moment and the seesaw shape does not allow the dipole moments to cancel out, the molecule is polar. If all the bonds were arranged symmetrically, in a tetrahedral shape, for example, the molecule would not be polar.
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