NHC molecules and phosphine ligands have been shown to stabilize radicals of this element. Bonding in compounds characterized by this element can be calculated through the styx rule. An organic compound of this element is often drawn with its bridged bicyclic rings represented by a banana. (10[1]-5[1])The prefixes (10[1])closo-, hypho-, nido-, (10[1])and arachno- are used to name cluster compounds containing hydrogen and this element, per Wade’s rules. This element tends to form three-center, two-electron bonds, leading it to often be called “electron deficient.” (10[1])Like beryllium and aluminum, this element can form (10[1])three bonds with no lone pair, violating the octet rule. A hydride of this element is used as a reducing agent. (10[1])For 10 points, name this element with (-5[1])atomic number 5. ■END■ (10[2])