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Aims. We calculate the plasma environment effects on the ionizationpotentials (IPs) and K-thresholds used in the modeling of K lines for all theions belonging to the isonuclear sequences of abundant elements apart fromoxygen and iron, namely: carbon, silicon, calcium, chromium, and nickel. Thesecalculations are used to extend the data points for the fits of the universalformulae, first proposed in our fourth paper of this series, to predict the IPand K-threshold lowerings in any elemental ion.  Methods. We used the fully relativistic multi-configuration Dirac-Fock (MCDF)method and approximated the plasma electron-nucleus and electron-electronscreenings with a time-averaged Debye-Huckel potential. Results. We report themodified ionization potentials and K-threshold energies for plasmascharacterized by electron temperatures and densities in the ranges of 10^5-10^7K and 10^18-10^22 cm^-3 . In addition, the improved universal fitting formulaeare obtained.  Conclusions. We conclude that since explicit calculations of the atomicstructures for each ion of each element under different plasma conditions isimpractical, the use of these universal formulae for predicting the IP andK-threshold lowerings in plasma modeling codes is still recommended. However,their comparatively moderate to low accuracies may affect the predictedopacities with regard to certain cases under extreme plasma conditions that arecharacterized by a plasma screening parameter of \mu > 0.2 a.u., especially forthe K-thresholds.

Plasma environment effects on K lines of astrophysical interest. V. Universal formulae for ionization potential and K-threshold shifts