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Energy levels, radiative rates and lifetimes are reported for the lowest 139levels of three Ne-like ions, namely Cu~XX, Zn~XXI and Ga~XXII. These levelsmostly belong to the 2s$^2$2p$^6$, 2s$^2$2p$^5$3$\ell$, 2s2p$^6$3$\ell$,2s$^2$2p$^5$4$\ell$, 2s2p$^6$4$\ell$, and 2s$^2$2p$^5$5$\ell$ configurations.For the calculations the general-purpose relativistic atomic structure package(GRASP) has been adopted. Comparisons are made with earlier availabletheoretical and experimental results, particularly among the lowest 27 levelsof the 2s$^2$2p$^6$ and 2s$^2$2p$^5$3$\ell$ configurations. Due to paucity ofsimilar data for higher lying levels, analogous calculations have also beenperformed with the flexible atomic code (FAC). These calculations help inassessing the accuracy of our calculated results, especially for the energylevels.

Radiative rates for E1, E2, M1, and M2 transitions in Ne-like Cu XX, Zn XXI and Ga XXII