Quadruple bond Quadruple bond A quadruple bond is a type of chemical bond between two atoms involving eight electrons. This bond is an extension of the more familiar types double bonds and triple bonds. Stable quadruple bonds are most common among the transition metals in the middle of the d-block, such as rhenium, tungsten, molybdenum and chromium. Typically the ligands that support quadruple bonds are π-donors, not π-acceptors. Chromium(II) acetate, Cr("μ"-OCCH)(HO), was the first chemical compound containing a quadruple bond to be synthesized. It was described in 1844 by E. Peligot, although its distinctive bonding was not recognized for more than a
Stations of the Resurrection any Church authorities sought to impose a definitive list, and as a result some churches have commissioned sets of sculptures for the Stations according to their own distinctive scheme which may not be followed elsewhere. (This is similar to the history of the Stations of the Cross, which attained their normative form only after many centuries of widely varying local practice.) As to the "number" of Stations, however, there is general agreement that in order to emphasise the complementarity between the Stations of the Cross and the Stations of the Resurrection there should be fourteen Stations of the Resurrection, as