This element’s hydrides are classified as “nido” or “arachno” by counting skeletal electron pairs in the Wade–Mingos rules. This element forms the anti-Markovnikov product (10[1])when added across a double bond, and is then oxidized with hydrogen peroxide to form alcohols in a reaction named “hydro [this element].” The (-5[1])wurtzite form of this element’s nitride is harder than diamond. A canonical Lewis (-5[1])acid is this element’s trifluoride, which is planar (10[1]-5[1])since this element violates the octet rule and only has (10[1])three valence electrons. For 10 points, what metalloid is located above aluminum on the periodic table and has atomic number five? (10[1])■END■ (10[2])