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Recently published empirical abundance maps, obtained through (Zeeman)Doppler mapping (ZDM), do not currently agree with the abundance structurespredicted by means of numerical models of atomic diffusion in magneticatmospheres of ApBp stars. In a first step towards the resolution of thesediscrepancies, we present a state of the art grid of equilibrium abundancestratifications in the atmosphere of a magnetic Ap star with T_eff = 10000 Kand log g = 4.0. A description of the behaviour of 16 chemical elementsincluding predictions concerning the over- and/or under-abundances over thestellar surface is followed by a discussion of the possible influence ofpresently neglected physical processes.

Abundance distributions over the surfaces of magnetic ApBp stars: theoretical predictions