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X-ray lineshifts of rare earth elements in the hexaborides of La, Ce, Pr, Nd, Sm, Eu, Gd, Yb, and Y relative to the corresponding tri-or difluorides are measured by the crystal diffraction method. The experimental shifts are compared with the values obtained in relativistic self-consistent field calculations in the effective free ion approximation. The hexaborides of La, Ce, Pr, Nd, and Gd are shown to have 4fn-15d configuration (4d for H), and those of Eu and Yb, 4 P configuration.

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