Respuesta :

PBCHEM
Atomic number of nitrogen is 7. Thus the electronic configuration of nitrogen is 1s2 2s2 2p3. 

The valence shell, is the outermost shell of an element. Nitrogen has 5 electrons in its valence shell (n = 2). 

Now, when gains 3 electrons to fill its outermost shell, it complete its octet. And when any system completes its octet, it becomes stable.
kenmyna

What happens when  nitrogen fills its valence  shell is that 3 electron are gained  creating N3- ion

calculation

  •     According to octet rule  atom tend to have  a  total of 8 electrons in its valence  shell
  • Nitrogen is a non metal which is in atomic number 7.
  • The  electron configuration  of nitrogen is 1S2 2S2 2P3  or [He] 2S2 2P3  or 2.5..
  • from the electron configuration  above Nitrogen  has 5  valence electrons, therefore it require  to gain 3 electron in order to fill its valence   shell.
  • when  3  electrons are gained   Nitrogen  create N3- ion.

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