A nonpolar molecule does not have a permanent dipole moment. For a molecule to not have a permanent dipole moment, the individual dipole moments of its bonds must cancel out.
(a) BF3 : Boron (EN = 2.04) goes in the center since boron is less electronegative than fluorine (EN = 3.98). The Lewis structure for BF3 is:
The molecules BF3, CF4, CO2, PF5, and SF6 are all nonpolar, even though they all contain polar bonds. Why?
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