So an Hbond donor is basically that group of atoms that contains the intramolecular bond between the electronegative atom and that H atom. So this if we zoom in on just this diagram this is our intramolecular bond that exists between these two atoms. And so this is the H bond donor and the other atom that contains that partial negative charge is the H bond acceptor. It can basically bond with this partially positive charge. Now the other type of intermolecular bond that you have to be familiar with in your study of biochemistry are the London Dispersion forces. Now in biochemistry sometimes the London Dispersion forces are also called Van der Valve forces.