What is a chemical bond?

A chemical bond is the force that holds atoms together in molecules and compounds. It forms when atoms share, transfer, or pool electrons to achieve stability, often aiming for a full outer electron shell (octet rule). The main types are ionic, covalent, and metallic bonds. Chemical bonds determine the structure, properties, and reactivity of substances. For example, in water (H₂O), covalent bonds form between hydrogen and oxygen. Bond strength and length vary depending on the type of atoms involved and their electronegativity differences.