When a tiny hydrogen atom is in a molecule with a much bigger ... Now we can actually see a real picture of a hydrogen bond between molecules of 8-Hydroxyquinoline in the images below.

The picture shows a close-up of one carbon atom. A hydrogen atom has one proton as the nucleus and one electron in the region outside the nucleus. The electron and proton are attracted to each other.

Like ordinary water—H 2 0—each molecule of heavy water contains two hydrogen atoms and one oxygen atom. The difference, though, lies in the hydrogen atoms. In ordinary water, each hydrogen ...