Three nitrogens and three of this element form the central ring of the so-called "inorganic benzene.
This element's hydrides come in forms like closo-, nido-, and arachno-, and were useful in formulating Wade's rules. Three nitrogens and three of this element form the central ring of the so-called "inorganic benzene." This element complexed to hydrogen is dissolved in THF in an anti-Markovnikov oxidation reaction partly named for it. The triatomic allotrope of this element is a 9.3 on the Mohs scale, and it often forms Lewis acids because of its three valence electrons. For 10 points, name this metalloid element, number five on the period table, with chemical symbol B.
This element's hydrides come in forms like closo-, nido-, and arachno-, and were useful in formulating Wade's rules.
{boron} [accept {B} before it is read]