This element’s hydrides are classified as “nido” or (10[1])“arachno” by counting skeletal electron pairs in the Wade–Mingos rules. This element forms the anti-Markovnikov product when added across a double bond, and is then oxidized with hydrogen peroxide to form alcohols in a reaction named “hydro [this element].” The wurtzite form of this element’s nitride is harder than diamond. (-5[1])A (10[1])canonical Lewis acid is this element’s trifluoride, which is planar (-5[1])since this element violates the octet rule and only has three valence electrons. (10[2])For 10 points, what (10[1])metalloid is located above aluminum on the periodic table and has atomic (10[1])number five? (10[1])■END■ (10[1]0[2])