Now, unlike this group which forms four Covalent bonds with other nonmetals, group 15 or five day forms three Covalent bonds and in addition, every single atom, except that nitrogen can form two more bonds using their higher D orbitals. Now we're going to talk more about D orbitals and P orbitals and S orbitals in another lecture. Let's look at C. Now nitrogen, this atom can form pi bonds just like carbon can form pi bonds in group 14. 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.