A compound consisting of 6 atoms of this element bound to lanthanum crystallizes to form a low temperature superconductor with a low work function. 40 atoms of this element can form spheres analogously to 60 atom carbon buckyballs. An extremely sterically hindered D2h molecule features two atoms of this element that are bridged by two hydrogens. Adding this element to pinacol or catechol leads to the formation of a 5-membered ring in which this element is bound to two oxygens and a hydrogen. Wade’s rules are used to predict the structure of compounds (10[3])containing this (10[1])element, which forms 3-center (10[1])2-electron bonds with hydrogen. This element forms 3 bonds without possessing a lone pair, thus violating the octet rule. For 10 points, name this element (-5[1])with atomic number 5. ■END■ (10[1])