\u00a9 2021 wikiHow, Inc. All rights reserved. For example, the electron configuration of lithium, 1s²2s¹, tells us that lithium has two electrons in the 1s subshell and one electron in the 2s subshell. Fill up orbitals in the order 1s, 2s, 2p, 3s, 3p, 4s, 3d, 4p - until you run out of electrons. wikiHow, Inc. is the copyright holder of this image under U.S. and international copyright laws. This explains the anomalous electron configuration of the transition metals and allows us to refine the electron configuration of Cu as: 1s22s22p63s23p64s13d10 (paramagnetic, 1 unpaired electron) and so becomes Cu+: 1s22s22p63s23p63d10 (diamagnetic; no unpaired electrons) so that we are consistent with experimental data. ", "It really helped me when am writing online exams. Electron configuration of atom shows, shells, sub shells and number of electrons in sub shells. If you want to learn how to find an electron configuration using an ADOMAH periodic table, keep reading! Solution for Give the ground-state electron configurations of the fol- lowing elements: (a) P (b) Тс (c) Ho Examples of these metals include \(Sc^{3+}\), \(Ti^{4+}\), \(Zn^{2+}\), and \(Cu^+\). Thank you, wikiHow editors. Our online electron configuration trivia quizzes can be adapted to suit your requirements for taking some of the top electron configuration quizzes. ", "The electron configuration helped me a lot more than anything. wikiHow, Inc. is the copyright holder of this image under U.S. and international copyright laws. So, the configuration for calcium ion is . This article was co-authored by Bess Ruff, MA. References Where; 1 is the principal quantum number or energy level (shell) s is the sub-level or sub shell (Capacity of s sub shell is 2 electron) 2 shows the number of electrons in the s sub shell. Last Updated: February 10, 2021 Electronic configuration: 1s 2 2s 2 2p 6 3s 2 3p 6 3d 10 4s 2 4p 6 4d 10 5s 2 5p 6 4f 11 5d 0 6s 2 >> Back to key information about the … An electron configuration is the arrangement of electron of an atom or a molecule in an atomic or molecular orbital. wikiHow, Inc. is the copyright holder of this image under U.S. and international copyright laws. Your support helps wikiHow to create more in-depth illustrated articles and videos and to share our trusted brand of instructional content with millions of people all over the world. We add electrons to fill the outermost orbital that is occupied, and then add more electrons to the next higher orbital. Electron orbitals are differently-shaped regions around an atom's nucleus where electrons are mathematically likely to be located. Predicting Electronic Configuration Using First Ionization Energy Using hydrogen as a base with a first ionization energy of 1312 kJ mol-1, we can predict the first ionization energy for helium to be 2 × 1312 = 1624 kJ mol-1 since helium has twice as many protons in the nucleus as hydrogen. Blocks of periods (s,p,d and f) are shown on the right side and shell numbers are shown at the base. ", "Thank you, I passed my exam with flying colors!