Illustrations Let us write the Lewis dot structure for CO and HCN molecules . 1. Carbon monoxide (CO) molecule. Step I. Total number of valence electrons = ( 4e- from C)+ (6e- from 0) = 10e-Step II. The skeletal structure is CO. Step III. Draw single bond between carbon and oxygen atom (one shared pair) and complete the octet on 0 atom. a.excess oxygen in the water b.death of ﬁsh c.decrease in oxygen in the water d.fertilizer run-off from the ground 7.Many scientists believe that global warming is caused by a.sun spots b.increase in carbon dioxide from burning fossil fuels 2
1. Write the Lewis electron-dot symbol for each of the following atoms: hydrogen, boron, nitrogen, silicon, sulfur, and bromine. 2. What information about a molecule does its Lewis structure provide? What information is neither shown nor implied in the Lewis structure? 3. There are several exceptions to the octet rule.