Here's why:
* Sharing Electrons: Covalent bonds form when atoms share electrons to achieve a stable outer electron shell.
* Oxygen's Need: Oxygen has six electrons in its outer shell and needs two more to become stable.
* Hydrogen's Need: Hydrogen has one electron in its outer shell and needs one more to become stable.
* The Bond: Each hydrogen atom shares its one electron with the oxygen atom, and the oxygen atom shares one of its electrons with each hydrogen atom. This sharing creates a stable bond between the atoms.
Let me know if you'd like more detail about covalent bonds!