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The study of molecules by molecular physics and theoretical chemistry is largely based on quantum mechanics and is essential for the understanding of the chemical bond. The simplest of molecules is the hydrogen molecule-ion, H 2 + , and the simplest of all the chemical bonds is the one-electron bond.
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.