![]() Boron trifluoride is a versatile lewis acid that forms adducts with such lewis bases as fluoride and ethers: Lewis structure, then the molecular geometry of the molecules. ![]() Hydrogen is usually surrounded by 4 electrons in a valid lewis structure. If you draw a trial structure in which br is the central atom and every atom has an octet, you will have used 20 electrons (2 lone pair on br).
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