Valence and the Structure of Atoms and Molecules

Gilbert N. Lewis, an American chemist, made significant contributions to understanding chemical bonding and the structure of atoms and molecules. Around 1916, he proposed that ionic bonds form through the complete transfer of electrons between atoms, aiming for each atom to achieve a stable electron configuration like that of a noble gas. He also theorized that covalent bonds involve the sharing of electron pairs between atoms, a concept visualized through his famous Lewis structures or "electron dot diagrams." This idea, often referred to as the octet rule, suggests atoms tend to gain, lose, or share electrons until they are surrounded by eight valence electrons. Lewis also developed an electronic theory of acids and bases, defining acids as electron-pair acceptors and bases as electron-pair donors.1234