  In this paper, energy levels, radiative rates and lifetimes are reported for
11 F-like ions with 12 $\le$ Z $\le$ 23. Up to 198 levels (depending on the
ion) have been considered which include 113 of the 2s$^2$2p$^5$, 2s2p$^6$,
2s$^2$2p$^4$3$\ell$, 2s2p$^5$3$\ell$, and 2p$^6$3$\ell$ configurations. The
general-purpose relativistic atomic structure package ({\sc grasp}) and the
flexible atomic code ({\sc fac}) have been adopted for calculating the energy
levels, but the {\sc grasp} alone for the remaining parameters. Radiative rates
(along with oscillator strengths and line strengths) are listed for all E1, E2,
M1, and M2 transitions of the ions. Comparisons are made with earlier available
theoretical and experimental energies, for all ions, in order to assess the
accuracy of the calculations. Comparisons have also been made for the radiative
rates and lifetimes, which have been possible for only those among the lowest
60 levels.

Atomic Physics