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Boranes are a class of compounds containing boron and hydrogen. While boron is a non-transition element, electron counting in boranes is based on the Wade's rules, which involves the concept of 'electron-deficient' bonding in these compounds.
To understand electron counting in boranes, you should focus on:
The number of valence electrons: Boron has 3 valence electrons and hydrogen has 1.
The number of skeletal electron pairs: This refers to the electrons involved in the bonding framework of the boron cage.
The Wade's rules: These rules predict the geometry and structure of boranes based on the number of skeletal electron pairs.
Many resources online and in textbooks cover these concepts. A good starting point would be a textbook on Inorganic Chemistry or specific chapters on boron chemistry.