b) The octet rule is obeyed, but this is not the structure of BF3. To see why it is not, determine the formal charges of B and F in this second structure. Valence e on B 3-% 8 bonding e- 0 lone pair e = Valence e on F1-% 1 bonding e- 2 lone pair e = +1 The formal charges are non-zero and there is a positive charge on the most electronegative element, F. The best resonance structures have the smallest possible formal charges, and negative charges on electronegative elements.

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b) The octet rule is obeyed, but this is not the structure of BF3. To see why it is not,
determine the formal charges of B and F in this second structure.
Valence e on B 3-½ 8 bonding e- 0
Valence e on F 7-% 1 bonding e- 1
lone pair e =
lone pair e = +1
The formal charges are non-zero and there is a positive charge on the most
electronegative element, F. The best resonance structures have the smallest possible
formal charges, and negative charges on electronegative elements.
Transcribed Image Text:b) The octet rule is obeyed, but this is not the structure of BF3. To see why it is not, determine the formal charges of B and F in this second structure. Valence e on B 3-½ 8 bonding e- 0 Valence e on F 7-% 1 bonding e- 1 lone pair e = lone pair e = +1 The formal charges are non-zero and there is a positive charge on the most electronegative element, F. The best resonance structures have the smallest possible formal charges, and negative charges on electronegative elements.
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