So let's begin with A. In a, we have an oh or a hydroxide molecule that has a negative one charge on the oxygen. Now, that negative one charge on the oxygen simply means that oxygen has one more electron than it does in its neutral state. In other words, in its neutral state, oxygen has eight electrons and eight protons. Now, a charge negative one oxygen molecule has eight protons, but now it has nine electrons. So let's draw our electron configuration for oxygen.