Now, this chlorine, or chloride atom now has an extra pair of non bonding electrons, and so it develops a negative charge. In the second step of this addiction reaction, we have the chloride ion donating a pair of non bombing electrons. So this is our lewis base and our lewis acid. And so we form the following final product. So, let's examine this picture more closely using molecular and atomic orbitals. So let's draw our molecular orbitals or atomic orbitals for this reaction.