This article reports the study of various inelastic channels such as positronium formation and ionization for positron scattering from group IIA elements. Modified spherical complex optical potential method developed by our group is employed for the present calculations for an extensive energy range from positronium formation threshold to 5 keV. Furthermore, a modified absorption threshold is introduced, which is utilized for targets having ionization threshold <6.8 eV. Comparison with existing data shows overall good agreement. Due to limited cross section studies on present targets, most of the results presented in this article have been reported for the first time. (C) 2017 Elsevier B.V. All rights reserved.