The fine-structure parameters are calculated semiempirically for a number of elements with the p² configuration: atoms of carbon, silicon, germanium, lead, and their isoelectronic sequences. The calculation is based on the matrix of the energy operator in the LS-coupling scheme, which describes the electrostatic interaction between two electrons and the magnetic spin-own-orbit, spin-other-orbit, spin-spin, and orbit-orbit interactions. Experimental energy values taken from the literature served as empirical data. Along with the fine-structure parameters, the energy intervals, the coupling coefficients, and the gyromagnetic ratios were calculated. The calculated results were compared with the data available in the literature. Approximate energy values were found for the ¹S₀ level of four elements (Ar V, Se III, Br IV, and Te III), for which experimental values are, to our knowledge, absent in the literature.