Posted by shay on Saturday, September 29, 2012 at 12:03am.
Look up the electronegativities of each pair. The higher EN will have a negative charge; the smaller EN will have a positive charge. So you can write delta - on the negative end and delta + on the positive end. For example,
N-H. EN for N is about 3.0 and H is about 2.1. That makes N the negative end and H the positive end.
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