  Energy levels, radiative rates and lifetimes are reported for the lowest 139
levels of three Ne-like ions, namely Cu~XX, Zn~XXI and Ga~XXII. These levels
mostly 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 available
theoretical and experimental results, particularly among the lowest 27 levels
of the 2s$^2$2p$^6$ and 2s$^2$2p$^5$3$\ell$ configurations. Due to paucity of
similar data for higher lying levels, analogous calculations have also been
performed with the flexible atomic code (FAC). These calculations help in
assessing the accuracy of our calculated results, especially for the energy
levels.
