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We calculated spectra of the first six members of the Mg-like isoelectronicsequence using different approximations. The most accurate results wereobtained with the configuration interaction + all order method (CI+AO), whichprovided relative accuracy for transition energies on the level of 0.1\%, orbetter. On this level of accuracy the Breit and QED corrections becomeimportant for the systems with nuclear charge $Z\gtrsim 20$. The retardationpart of the Breit interaction and QED corrections for the partial waves with$l\ne 0$ are still too small to be important.

Correlation, Breit, and QED effects in spectra of Mg-like ions