A theoretical investigation oil the mixed valence behavior, or bistability, of a series of anionic linear chains composed of beryllium atoms is presented, Calculations on Be (N) over bar (with N = 7, ..., 13) were performed at CAS-SCF and MR-CI levels by using an ANO basis set containing 6s4p3d2f contracted orbitals for each atom. Our results show a consistent gradual shift between different classes of mixed valence compounds as the number of beryllium atoms increases, from strong coupling (class III) toward valence-trapped (class II). Indeed, in the largest cases (N > 10), the anionic chains were found to become asymptotically closer to class 1, where the Coupling vanishes. The intramolecular electron-transfer parameters V-ab, E-barr, and E-opt were calculated for each atomic chain. It is shown that the decrease Of V-ab with increasing N follows an exponential pattern.