Boron, which also has three unpaired valence electrons in its Lewis dot symbol, also tends to form compounds with three bonds, whereas carbon, with four unpaired valence electrons in its Lewis dot symbol, tends to share all of its unpaired valence electrons by forming compounds in which it has four bonds.
Boron is the least electronegative atom in the BF3 Lewis structure and therefore goes at the center of the structure. Boron is an exception and only needs 6 valence electrons in its outer shell.
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Boron, which also has three unpaired valence electrons in its Lewis dot symbol, also tends to form compounds with three bonds, whereas carbon, with four unpaired valence electrons in its Lewis dot symbol, tends to share all of its unpaired valence electrons by forming compounds in which it has four bonds.
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Explanation:
Boron is the least electronegative atom in the BF3 Lewis structure and therefore goes at the center of the structure. Boron is an exception and only needs 6 valence electrons in its outer shell.