Saleh, G., Alizadeh, R. and Dalili, A. 2020. WHY THE ELECTRON IS NEGATIVELY CHARGED AND THE PROTON POSITIVELY? . MATTER: International Journal of Science and Technology. 6, 1 (Apr. 2020), 26–32. DOI:https://doi.org/10.20319/mijst.2020.61.2632.