And these pi bonds can be triple bonds or double bonds. And they're relatively strong. But unlike this group, we have one more atom here, our phosphorus, that can form a double bond, but it's a weak double bond. But regardless, it's still a double bond, a pi bond. Now let's look at one more thing. Let's look at our N. Now normally when we have nitrogen in a molecule or compound that nitrogen has a lone pair of electrons.