Chemical bonds and quantum entanglement I have a very basic understanding of quantum mechanics and chemistry, so please bear with any misunderstandings I may have. My question is this: what does QM have to do with the bonding between atoms in a molecule or compound? Can these bonds be labelled as "existing in an entangled state?" For example, in a water molecule, there are two H atoms bonded to an O atom. Are these two H atoms "entangled" with the O atom, thereby creating a molecule, which is then itself in an entangled state? (BTW I wish I had my chem 1010 book here, as I hope I didn't screw up any definitions).