Li(s)+n2(g)→li3n(s) express your answer as a balanced chemical equation. identify all of the phases in your answer.

  equation  is   balanced  when  the  number  of  molecules     are  the  equal  in  both  reacting  side  and  the  product side.
Li(s)  +  n2(g) ---> Li3n(s)
From   the  equation  above  the  reaction  is not  balanced  since    the  molecules  are  not  equal  in  both  reacting  side  and  the  product   side.

The reaction  is  balanced   by  adding   6  in  front  of  Li  and  2  infront  of  Li3n
  that  is
 6Li(s)  + n2(g)>  2Li3n(s)

The correct answer should be "electrons orbit the nucleus in circular motions exactly as shown on the classic bohr model."