Textbook Problem

Write a Lewis structure for each of the following simple molecules. Show all bonding valence electron pairs as lines and all nonbonding valence electron pairs as dots.

msp;  $\begin{array}{l}\text{a}.{\text{ NBr}}_{\text{3}} \text{c}.{\text{ CBr}}_{\text{4}}\\ \text{b}.\text{ HF} \text{d}.{\text{ C}}_{\text{2}}{\text{H}}_{\text{2}}\end{array}$