Quadruple bond electrons (σπδδ*) has an Os–Os triple bond and a staggered geometry. Many other compounds with quadruple bonds between transition metal atoms have been described, often by Cotton and his coworkers. Isoelectronic with the dirhenium compound is the salt K[MoCl] (potassium octachlorodimolybdate). An example of a ditungsten compound with a quadruple bond is ditungsten tetra(hpp). Quadruple bonds between atoms of main group elements are unknown. Molecular orbital theory shows that there are two sets of paired electrons in the sigma system (one bonding, one antibonding), and two sets of paired electrons in a degenerate π-bonding set of orbitals. This adds up
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