1) Metal hydride 
Plumbane, PbH4, is a metal hydride composed of lead and hydrogen. Plumbane is not well-characterized or well-known, and it is thermodynamically unstable with respect to the loss of a hydrogen atom. Derivatives of plumbane include lead tetrafluoride, PbF4, and tetraethyllead, (CH3CH2)4Pb. ==History== Until recently, it was uncertain whether plumban...