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In order to test the validity of the LS-coupling approximation for light elements, the line-intensity ratios of the 38-3p and 3p-3d multiplets in C II through F v and C II through Ne vj. , respectively, have been investigated experimentally with emission sources. Also, calculations with multicon6guration Dirac-Fock wave functions have been performed. Within the errors of the experimental procedure, no signi6cant violations of the LS-coupling approximation were found for the lines of the 3s-3p and 3p-3d multiplets in CII through F V. However, in the case of Nevi, small deviations of measured intensities from those obtained by applying the LS-coupling approximation were observed.PACS number(s): 32. VO.Fw, 32.30.Jc, 31.20.Tz, 32.70.Cs