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carbon 4 bonds
0
carbon with lone pair (not 4 bonds)
negative 1
carbon no lone pair (not 4 bonds)
positive 1
N & P 3 bonds & 1 lone pair
0
N & P 4 bonds
+1
N & P 2 bonds
-1
O & S 2 bonds & 2 lone pairs
0
O & S 3 bonds
+1
O & S 1 bond
-1