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. Two banana-shaped bonds appear in a compound consisting of two atoms of this element and six hydrogen atoms; those bonds are three-center two-electron bonds. The hexagonal form of this element’s nitride has a structure analogous to graphene. With the halogens, (-5[1])this element forms trigonal planar compounds that are considered (-5[1])“electron-deficient,” such as a trifluoride that violates the (-5[1])octet rule. For 10 points, name this lightest metalloid element with atomic number five, (10[1])symbolized B. ■END■ (10[3])

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