Drawing the Lewis Structure for BF3

Viewing Notes:

  • The BF3 Lewis structure is similar to BCl3 and BBr3 since Cl and Br are in Group 7 and have 7 valence electrons.
  • Boron (B) doesn't need 8 valence electrons to have an octet (Boron often only needs 6).
  • If you're not sure you have the best Lewis structure for BF3 you can calculate the formal charges. You'll find the B in BF3 only has 6 valence electrons.
  • For the BF3 Lewis structure there are a total of 24 valence electrons available.
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Frequently Tested Lewis Structures

Basic
CH4,   NH3,   C2H4,   O2,   N2

Intermediate
O3,   BBr3,   I3-,   BrF5,   NO

Advanced
SO3,   H2SO4,   OCN-,   XeO3,   ClO4-