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$F.\ Charge= NVE-LPE-BE/2$ a) N: $5-2-6/2=0$ H: $1-0-2/2=0$ b) P: $5-0-8/2=+1$ O: $6-6-2/2=-1$ c) B: $3-0-8/2=-1$ H:$1-0-2/2=0$ d) N: $5-2-6/2=0$ O: N: $6-4-4/2=0$ H:$1-0-2/2=0$
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