We're SP three in this methyl, anion molecule. And now this pair of electrons will tend to act as a lewis base, donating these two electrons to some other atom. Now let's look at the final methyl radical. Now, the methyl radical is a combination of the following two drawings. Now, at one given point, it's in this state, and another given point, it's in this state. So it inverts from this form to this form.