Round 1: Tossup 11

The study of the deltahedral structures of this element’s hydride clusters motivated the development of polyhedral skeletal electron pair theory. (10[1])Two banana-shaped bonds appear (10[1])in a compound consisting of two atoms of this element and six hydrogen atoms; those bonds are three-center (-5[1])two-electron bonds. The hexagonal form of this element’s (-5[1])nitride has a structure analogous to graphene. With the halogens, this element forms trigonal planar compounds that are considered “electron-deficient,” such as a (10[1])trifluoride that violates the octet rule. For 10 points, name this lightest metalloid element with atomic number five, (10[2])symbolized B. ■END■ (10[4])

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