Final answer:
The bond holding hydrogen and oxygen atoms together in a water molecule is a covalent bond, where electrons are shared between the oxygen atom and each hydrogen atom.
Step-by-step explanation:
The type of bond holding hydrogen and oxygen atoms together in a single H2O molecule is a covalent bond. In this arrangement, the oxygen atom shares one pair of valence electrons with each hydrogen atom, forming two covalent bonds to hold the water molecule together. Each hydrogen atom contributes one electron, and these shared electrons help to complete the oxygen atom's outer electron shell, leading to a more stable configuration for the molecule.