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Magnetic quadrupole and electric octupole transitions from the configurations$4p^54d^{N+1}$ and $4p^64d^{N-1}4f$ were calculated along with magnetic dipole,electric dipole and electric quadrupole radiative transitions inquasirelativistic Hartree-Fock approximation. Their significance in determiningthe metastable level radiative lifetimes was investigated along severalisoelectronic sequences for the ions from $Z=50$ to $Z=92$. Strontium-likeions, zirconium-like ions, molybdenum-like ions and rhodium-like ions werestudied comprehensively. Remaining isoelectronic sequences with the groundconfiguration $4d^{N}$ ($N=1,3,5,7,8,10$) were also reviewed albeit in lessdetail. A systematic trends of determined total radiative lifetimes werestudied. The importance of magnetic quadrupole and electric octupoletransitions from metastable levels of ions from these isoelectronic sequenceswas investigated and discussed. Inclusion of such transitions of highermultipole order can change theoretical radiative lifetime values for somelevels more than ten times. These cases can not be established in advance,without `performing detailed calculations.

Significance of M2 and E3 transitions for $4p^54d^{N+1}$ and $4p^64d^{N-1}4f$ configuration metastable level lifetimes