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Element

Expanded Orbital Occupancy Electron Configuration

( When terms are enclosed in brackets, they are the closed-shell electron configuration for the closest noble gas with a lower atomic number. )

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Actinium

[1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 4f14 5s2 5p6 5d10 6s2 6p6] 6d1 7s2          

Aluminum

[1s2 2s2 2p6] 3s2 3p1                                                              

Americium

[1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 4f14 5s2 5p6 5d10 6s2 6p6] 5f7 7s2          

Antimony

[1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6] 4d10 5s2 5p3                                    

Argon

[1s2 2s2 2p6] 3s2 3p6                                                              

Arsenic

[1s2 2s2 2p6 3s2 3p6] 3d10 4s2 4p3                                                 

Astatine

[1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 5s2 5p6] 4f14 5d10 6s2 6p5                  

Barium

[1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 5s2 5p6] 6s2                                

Berkelium

[1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 4f14 5s2 5p6 5d10 6s2 6p6] 5f9 7s2          

Beryllium

[1s2] 2s2                                                                          

Bismuth

[1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 5s2 5p6] 4f14 5d10 6s2 6p3                  

Bohrium

[1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 4f14 5s2 5p6 5d10 6s2 6p6] 5f14 6d5 7s2     

Boron

[1s2] 2s2 2p1                                                                      

Bromine

[1s2 2s2 2p6 3s2 3p6] 3d10 4s2 4p5                                                 

Cadmium

[1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6] 4d10 5s2                                        

Calcium

[1s2 2s2 2p6 3s2 3p6] 4s2                                                          

Californium

[1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 4f14 5s2 5p6 5d10 6s2 6p6] 5f10 7s2         

Carbon

[1s2] 2s2 2p2                                                                      

Cerium

[1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 5s2 5p6] 4f1 5d1 6s2                        

Cesium

[1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 5s2 5p6] 6s1                                

Chlorine

[1s2 2s2 2p6] 3s2 3p5                                                              

Chromium

[1s2 2s2 2p6 3s2 3p6] 3d5 4s1                                                      

Cobalt

[1s2 2s2 2p6 3s2 3p6] 3d7 4s2                                                      

Copernicium

[1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 4f14 5s2 5p6 5d10 6s2 6p6] 5f14 6d10 7s2    

Copper

[1s2 2s2 2p6 3s2 3p6] 3d10 4s1                                                     

Curium

[1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 4f14 5s2 5p6 5d10 6s2 6p6] 5f7 6d1 7s2      

Darmstadtium

[1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 4f14 5s2 5p6 5d10 6s2 6p6] 5f14 6d9 7s1     

Dubnium

[1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 4f14 5s2 5p6 5d10 6s2 6p6] 5f14 6d3 7s2     

Dysprosium

[1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 5s2 5p6] 4f10 6s2                           

Einsteinium

[1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 4f14 5s2 5p6 5d10 6s2 6p6] 5f11 7s2         

Erbium

[1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 5s2 5p6] 4f12 6s2                           

Europium

[1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 5s2 5p6] 4f7 6s2                            

Fermium

[1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 4f14 5s2 5p6 5d10 6s2 6p6] 5f12 7s2         

Flerovium

[1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 4f14 5s2 5p6 5d10 6s2 6p6] 5f14 6d10 7s2 7p2

Fluorine

[1s2] 2s2 2p5                                                                      

Francium

[1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 4f14 5s2 5p6 5d10 6s2 6p6] 7s1              

Gadolinium

[1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 5s2 5p6] 4f7 5d1 6s2                        

Gallium

[1s2 2s2 2p6 3s2 3p6] 3d10 4s2 4p1                                                 

Germanium

[1s2 2s2 2p6 3s2 3p6] 3d10 4s2 4p2                                                 

Gold

[1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 5s2 5p6] 4f14 5d10 6s1                      

Hafnium

[1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 5s2 5p6] 4f14 5d2 6s2                       

Hassium

[1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 4f14 5s2 5p6 5d10 6s2 6p6] 5f14 6d6 7s2     

Helium

1s2                                                                                

Holmium

[1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 5s2 5p6] 4f11 6s2                           

Hydrogen

1s1                                                                                

Indium

[1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6] 4d10 5s2 5p1                                    

Iodine

[1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6] 4d10 5s2 5p5                                    

Iridium

[1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 5s2 5p6] 4f14 5d7 6s2                       

Iron

[1s2 2s2 2p6 3s2 3p6] 3d6 4s2                                                      

Krypton

[1s2 2s2 2p6 3s2 3p6] 3d10 4s2 4p6                                                 

Lanthanum

[1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 5s2 5p6] 5d1 6s2                            

Lawrencium

[1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 4f14 5s2 5p6 5d10 6s2 6p6] 5f14 7s2 7p1     

Lead

[1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 5s2 5p6] 4f14 5d10 6s2 6p2                  

Lithium

[1s2] 2s1                                                                          

Livermorium

[1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 4f14 5s2 5p6 5d10 6s2 6p6] 5f14 6d10 7s2 7p4

Lutetium

[1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 5s2 5p6] 4f14 5d1 6s2                       

Magnesium

[1s2 2s2 2p6] 3s2                                                                  

Manganese

[1s2 2s2 2p6 3s2 3p6] 3d5 4s2                                                      

Meitnerium

[1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 4f14 5s2 5p6 5d10 6s2 6p6] 5f14 6d7 7s2     

Mendelevium

[1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 4f14 5s2 5p6 5d10 6s2 6p6] 5f13 7s2         

Mercury

[1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 5s2 5p6] 4f14 5d10 6s2                      

Molybdenum

[1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6] 4d5 5s1                                         

Neodymium

[1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 5s2 5p6] 4f4 6s2                            

Neon

[1s2] 2s2 2p6                                                                      

Neptunium

[1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 4f14 5s2 5p6 5d10 6s2 6p6] 5f4 6d1 7s2      

Nickel

[1s2 2s2 2p6 3s2 3p6] 3d8 4s2                                                      

Niobium

[1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6] 4d4 5s1                                         

Nitrogen

[1s2] 2s2 2p3                                                                      

Nobelium

[1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 4f14 5s2 5p6 5d10 6s2 6p6] 5f14 7s2         

Osmium

[1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 5s2 5p6] 4f14 5d6 6s2                       

Oxygen

[1s2] 2s2 2p4                                                                      

Palladium

[1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6] 4d10                                            

Phosphorus

[1s2 2s2 2p6] 3s2 3p3                                                              

Platinum

[1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 5s2 5p6] 4f14 5d9 6s1                       

Plutonium

[1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 4f14 5s2 5p6 5d10 6s2 6p6] 5f6 7s2          

Polonium

[1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 5s2 5p6] 4f14 5d10 6s2 6p4                  

Potassium

[1s2 2s2 2p6 3s2 3p6] 4s1                                                          

Praseodymium

[1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 5s2 5p6] 4f3 6s2                            

Promethium

[1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 5s2 5p6] 4f5 6s2                            

Protactinium

[1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 4f14 5s2 5p6 5d10 6s2 6p6] 5f2 6d1 7s2      

Radium

[1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 4f14 5s2 5p6 5d10 6s2 6p6] 7s2              

Radon

[1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 5s2 5p6] 4f14 5d10 6s2 6p6                  

Rhenium

[1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 5s2 5p6] 4f14 5d5 6s2                       

Rhodium

[1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6] 4d8 5s1                                         

Roentgenium

[1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 4f14 5s2 5p6 5d10 6s2 6p6] 5f14 6d10 7s1    

Rubidium

[1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6] 5s1                                             

Ruthenium

[1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6] 4d7 5s1                                         

Rutherfordium

[1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 4f14 5s2 5p6 5d10 6s2 6p6] 5f14 6d2 7s2     

Samarium

[1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 5s2 5p6] 4f6 6s2                            

Scandium

[1s2 2s2 2p6 3s2 3p6] 3d1 4s2                                                      

Seaborgium

[1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 4f14 5s2 5p6 5d10 6s2 6p6] 5f14 6d4 7s2     

Selenium

[1s2 2s2 2p6 3s2 3p6] 3d10 4s2 4p4                                                 

Silicon

[1s2 2s2 2p6] 3s2 3p2                                                              

Silver

[1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6] 4d10 5s1                                        

Sodium

[1s2 2s2 2p6] 3s1                                                                  

Strontium

[1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6] 5s2                                             

Sulfur

[1s2 2s2 2p6] 3s2 3p4                                                              

Tantalum

[1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 5s2 5p6] 4f14 5d3 6s2                       

Technetium

[1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6] 4d5 5s2                                         

Tellurium

[1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6] 4d10 5s2 5p4                                    

Terbium

[1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 5s2 5p6] 4f9 6s2                            

Thallium

[1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 5s2 5p6] 4f14 5d10 6s2 6p1                  

Thorium

[1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 4f14 5s2 5p6 5d10 6s2 6p6] 6d2 7s2          

Thulium

[1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 5s2 5p6] 4f13 6s2                           

Tin

[1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6] 4d10 5s2 5p2                                    

Titanium

[1s2 2s2 2p6 3s2 3p6] 3d2 4s2                                                      

Tungsten

[1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 5s2 5p6] 4f14 5d4 6s2                       

Uranium

[1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 4f14 5s2 5p6 5d10 6s2 6p6] 5f3 6d1 7s2      

Vanadium

[1s2 2s2 2p6 3s2 3p6] 3d3 4s2                                                      

Xenon

[1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6] 4d10 5s2 5p6                                    

Ytterbium

[1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 5s2 5p6] 4f14 6s2                           

Yttrium

[1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6] 4d1 5s2                                         

Zinc

[1s2 2s2 2p6 3s2 3p6] 3d10 4s2                                                     

Zirconium

[1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6] 4d2 5s2                                         

References    (Click the button next to a value above to see complete citation information for that entry)

Fritzsche, S., C. Z. Dong, F. Koike, and A. Uvarov. "The Low-Lying Level Structure of Atomic Lawrencium (Z = 103): Energies and Absorption Rates." The European Physical Journal D — Atomic, Molecular, Optical and Plasma Physics, volume 45, number 1, 2007, pp. 107–113. doi:10.1140/epjd/e2007-00136-3

Huheey, James E., Ellen A. Keiter, and Richard L Keiter. Inorganic Chemistry: Principles of Structure and Reactivity, 4th edition. New York: HarperCollins College Publishers, 1993.

Indelicato, P., J. P. Santos, S. Boucard, and J.-P. Desclaux. "QED and Relativistic Corrections in Superheavy Elements." The European Physical Journal D - Atomic, Molecular, Optical and Plasma Physics, volume 45, number 1, 2007, pp. 155–170. doi:10.1140/epjd/e2007-00229-y

Kaldor, Uzi, Ephraim Eliav, and Arie Landau. "Accurate Relativistic Fock-Space Calculations for Many-Electron Atoms." pp. 81–119 in Relativistic Electronic Structure Theory Part 2: Applications. Edited by Peter Schwerdtfeger. Amsterdam: Elsevier B. V., 2004.

Lide, David R., editor. CRC Handbook of Chemistry and Physics, 88th edition. Boca Raton, Florida: Taylor & Francis Group, 2008.

Martin, W. C. "Electronic Structure of the Elements." The European Physical Journal C — Particles and Fields, volume 15, number 1–4, 2000, pp. 78–79. doi:10.1007/BF02683401

Miessler, Gary L., and Donald A. Tarr. Inorganic Chemistry, 3rd edition. Upper Saddle River, NJ: Pearson Prentice Hall, 2004.

Sansonetti, J. E., and W. C. Martin. "Handbook of Basic Atomic Spectroscopic Data." Journal Of Physical And Chemical Reference Data, volume 34, number 4, 2005, pp. 1559–2259. doi:10.1063/1.1800011

Seaborg, Glenn T., and Walter D. Loveland. The Elements Beyond Uranium. New York: John Wiley & Sons, Inc., 1990.