1) Count the number of valence electrons.

POCl₃

phosphorus has 5 and there is 1 phosphorus = 5
oxygen has 6 and there is only 1 oxygen = 6
chlorine has 7 and there are 3 chlorine = 21

That gives us a total of 32 electrons, so we will
need a total of 32 electrons in bonds and our
non-bonded pairs.




 
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