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The double bond rule states that chemical elements with a principal quantum number greater than 2 for their valence electrons tend not to form multiple bonds. The double bonds, when they exist, are often weak due to poor orbital overlap. Although such compounds are not intrinsically unstable, they instead tend to polymerize. An example is the rapid polymerization that occurs upon condensation of disulfur, the heavy analogue of O2. Numerous violations to the rule exist.
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