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Covalent chemical bonds involve the sharing of a pair of valence electrons by two atoms, in contrast to the transfer of electrons in ionic bonds. Such bonds lead to stable molecules if they share electrons in such a way as to create a noble gas configuration for each atom. Hydrogen gas forms the simplest covalent bond in the diatomic hydrogen molecule. The halogens such as chlorine also exist as diatomic gases by forming covalent bonds.
Answers. Best Answer: These would be the outer, most loosely held electrons known as valence electrons. The way in which these electrons interact with each other and with the nuclei determine the kinds of bond. A valence bond is formed when the nuclei go halves in sharing the outer electrons. An ionic bond is formed when one of the atoms holds its electrons much more tightly than the other so that the electrons tend to spend most of their time around one of the atoms at the expense of the other. A polar valence bond is intermediate between an ionic bond and a symmetric valence bond.