Boron forms a number of different complexes with hydrogen, collectively called boranes. They often feature electron-deficient bonding in the form of bridging H groups, as in the simplest such complex, B2H6. If nothing else, they're cool molecules to look at.
Note the connecting lines generally do not represent "normal" 2c2e bonds, but rather are meant to convey a sense of the framework of the atoms. Bonding in higher boranes and other clusters will be described later in the course, time and weather permitting.
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