Bob T.

asked • 09/14/14

How is PCl5 a polyatomic compound and where did the ionic charge of 5 come from?

On the periodic table phosphorus charge is 3- and chloride charge is -1. I'm confused where the ionic charge of 5 came from.
I'm told that PCl5 is Polyatomic compound HOWEVER neither element is listed in my list of polyatomic ions (ex: CO3, OH-, NO3 etc), so how is it polyatomic compound when it looks like an ionic compound?
Another example is AlN, that's apparently a polyatomic compound too but neither is a polyatomic ion?
Thank you so much in advance

1 Expert Answer


Phillip R. answered • 09/14/14

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