eng Science and Education Publishing World Journal of Chemical Education 2375-1657 2016-01-03 3 6 160 167 10.12691/wjce-3-6-5 WJCE2015365 article Tangour Bahoueddine baha.tangour@gmail.com 1 Université de Tunis El Manar, Research Unit of Modeling Fundamental Sciences and Didactics, Tunisia 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. http://pubs.sciepub.com/wjce/3/6/5/wjce-3-6-5.pdf Pauli principle Madelung-Klechkowski and Hund rules aufbau principle