1. Draw the Lewis structure and the structural formula for each of the following molecules:
   

A$NBr _3$

B$CF _4$

C$N _2$

D$C _2 H _4$

1. Draw the Lewis structure and the structural formula for each of the following polyatomic ions:
   

A$PO _3{ }^{3-}$

B$CN ^{-}$$

C$NO _2{ }^{-}$

D$ClO ^{-}$