 In the superactinide series, the 7d3/2, 8p1/2, 6f5/2 and 5g7/2 shells should all fill simultaneously.This creates very complicated situations, so much so that complete and accurate CCSD calculations have been done only for elements 121 and 122.The first superactinide, unbiunium (element 121), should be similar to lanthanum and actinium