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The lithium abundance attracts exceptional attention among numerous chemical anomalies of Ap stars. The reason is that large variations of atmospheric abundance of this element have been found among Ap stars, but the effect of the magnetic field on the only observable Li line (6708 Â) complicates the interpretation of observations. From Michaud's radiative diffusion theory one may expect this element to be underabundant, because most of it is ionized and it has a noble gas electronicdoi:10.1515/astro-1997-0264 fatcat:4msxmds2o5aqrkup7ziqhempaa