Science and Education Publishing World Journal of Chemical Education 2375-1657 3 6 2016 1 3 Beyond the Madelung-Klechkowski Rule of aufbau Orbital Filling Principle 160 167 EN Tangour Bahoueddine Université de Tunis El Manar, Research Unit of Modeling Fundamental Sciences and Didactics, Tunisia WJCE2015365 10.12691/wjce-3-6-5 2015 8 10 2015 11 29 2016 1 1 We propose a more general wording for Madelung rule using a new descriptor based on the four quantum numbers n, ℓ, mℓ, ms of the most recently added electron notes K(ZX). By this formulation, K(ZX) will increment as the atomic number Z increases. No exceptions will remain. It can be connected to the first ionization energy.