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!
 
Group 15 has 5 valence electrons. Nitrogen is part of this group. There are 3 bonded nitrogens in this molecule, so 5 times 3= 15. the charge is -1. an electron is gained, thus the valence electrons= 16


note: if the charge is +2, +3, +4 that means x amount of electrons are lost
if the charge decreases, then electrons are gained.
 
Group 15 has 5 valence electrons. Nitrogen is part of this group. There are 3 bonded nitrogens in this molecule, so 5 times 3= 15. the charge is -1. an electron is gained, thus the valence electrons= 16


note: if the charge is +2, +3, +4 that means x amount of electrons are lost
if the charge decreases, then electrons are gained.
 
Group 15 has 5 valence electrons. Nitrogen is part of this group. There are 3 bonded nitrogens in this molecule, so 5 times 3= 15. the charge is -1. an electron is gained, thus the valence electrons= 16


note: if the charge is +2, +3, +4 that means x amount of electrons are lost
if the charge decreases, then electrons are gained.
 
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