How many valence electrons are on N3-?

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RandyMullis

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Could someone please explain this to me. A question on one of my practice quizzes asked "How many valence electrons are on N3- (3 being a subscript and - being a superscript). I got 18, but it said the correct answer was 16. ?? help.
Okay. So basically instead of adding it to each atom. It gets added to the total? Thanks Much!
 
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