Find pairs of elements who are out of order with respect to their atomic masses. The pairs of elements which are out of sequence are: Lr and Rf, or Pu and Am, or Ar and K, or Co and Ni, or Th and Pa, or Ti and Pb, or Rf and Db, or Te and I, or U and Np, or Sg and Bh, or N and O, Tb and Dy