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Resonance energies and total natural width of the 3pns 1P° and 3pnd 1P° Rydberg series of Mg-like (Z=13–26) ions are reported. Resonance energies of the Mg-like Al+ belonging to the 3pns 3P°→2p36pP1/202 and 3pns 3P°→2p36pP3/202 transitions are also tabulated. The calculations are made in the framework of the Screening constant by unit nuclear charge (SCUNC) formalism. Excellent agreements between...