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