Word Count : 434

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Heterocarboranes are polyhedral borane–carborane cluster compounds in which one or more vertices of a conventional carborane framework are occupied by atoms other than boron and carbon. Carboranes themselves are polyhedral clusters containing boron, carbon and hydrogen, such as closo-C₂B₁₀H₁₂. When heteroatoms are incorporated into such cages, the resulting compounds are called heterocarboranes. The incorporation of heteroatoms modifies the electron count, geometry, stability, acidity and chemical reactivity of the cluster. The elements involved in heterocarboranes may include boron (B) and carbon (C) as the basic cage-forming elements, _______ ________ __________ _______ ______ ____ ______.
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