How many total of NI^3 valence electrons?What is lewis structure?What is molecular shape?What is bond angle?Is NI^3 polor or non-polar?

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jerichorayel | College Teacher | (Level 2) Senior Educator

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NI3 is called Triiodoamine or nitrogen triiodide. First we need to count the total number of valence electrons. We just add the valence electrons of each atoms involved.

N = 5

I = 7 x 3


     26 electrons

Next, we have to assign the central atom; In this case it is N.

Now we have to connect the atoms and form a bond. we can form three N-I bonds


      I -  N - I



Finally, we have to distribute The remaining electrons on Br and N provided that it follows the octet rule. 

     ..    ..    ..

   :  I -  N - I  :


         :  I  :


NI3 has a similar structure with NH3. But the size of I makes the molecule nearly flat. It is still a polar molecule but has been found to be insoluble in water. Bond angle of which is a little bit greater than 109.5 degrees. 

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