text: After the 118 elements now known, Pekka Pyykkö predicts that the orbital shells will fill up in this order:
  *8s,
  *5g,
  *the first two spaces of 8p,
  *6f,
  *7d,
  *9s,
  *the first two spaces of 9p,
  *the rest of 8p.
  He also suggests that period 8 be split into three parts:
  *8a, containing 8s,
  *8b, containing the first two elements of 8p,
  *8c, containing 7d and the rest of 8p.
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  The compact version:<br>
  Pekka Pyykkö correctly predicted the existence of chemical bonds between gold and the noble gas xenon, which is usually inert; this bond is known to occur in the cationic complex tetraxenonogold(II) (). He also correctly predicted the existence of gold–carbon triple bonds.