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Electron Configuration

( [He], [Ne], [Ar], [Kr], [Xe], and [Rn] represent the closed-shell electron configurations of these elements. )

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Element

Orbital Occupancy

Orbital Filling Order

Term Symbol

Actinium

[Rn] 6d1 7s2          

[Rn] 7s2 6d1          

2D3/2

Aluminum

[Ne] 3s2 3p1          

[Ne] 3s2 3p1          

2P1/2

Americium

[Rn] 5f7 7s2          

[Rn] 7s2 5f7          

8S7/2

Antimony

[Kr] 4d10 5s2 5p3     

[Kr] 5s2 4d10 5p3     

4S3/2

Argon

[Ne] 3s2 3p6          

[Ne] 3s2 3p6          

1S0

Arsenic

[Ar] 3d10 4s2 4p3     

[Ar] 4s2 3d10 4p3     

4S3/2

Astatine

[Xe] 4f14 5d10 6s2 6p5

[Xe] 6s2 4f14 5d10 6p5

2P3/2

Barium

[Xe] 6s2              

[Xe] 6s2              

1S0

Berkelium

[Rn] 5f9 7s2          

[Rn] 7s2 5f9          

6H15/2

Beryllium

[He] 2s2              

[He] 2s2              

1S0

Bismuth

[Xe] 4f14 5d10 6s2 6p3

[Xe] 6s2 4f14 5d10 6p3

4S3/2

Bohrium

[Rn] 5f14 6d5 7s2     

[Rn] 7s2 5f14 6d5     

6S5/2

Boron

[He] 2s2 2p1          

[He] 2s2 2p1          

2P1/2

Bromine

[Ar] 3d10 4s2 4p5     

[Ar] 4s2 3d10 4p5     

2P3/2

Cadmium

[Kr] 4d10 5s2         

[Kr] 5s2 4d10         

1S0

Calcium

[Ar] 4s2              

[Ar] 4s2              

1S0

Californium

[Rn] 5f10 7s2         

[Rn] 7s2 5f10         

5I8

Carbon

[He] 2s2 2p2          

[He] 2s2 2p2          

3P0

Cerium

[Xe] 4f1 5d1 6s2      

[Xe] 6s2 4f1 5d1      

1G4

Cesium

[Xe] 6s1              

[Xe] 6s1              

2S1/2

Chlorine

[Ne] 3s2 3p5          

[Ne] 3s2 3p5          

2P3/2

Chromium

[Ar] 3d5 4s1          

[Ar] 4s1 3d5          

7S3

Cobalt

[Ar] 3d7 4s2          

[Ar] 4s2 3d7          

4F9/2

Copernicium

[Rn] 5f14 6d10 7s2    

[Rn] 7s2 5f14 6d10    

Copper

[Ar] 3d10 4s1         

[Ar] 4s1 3d10         

2S1/2

Curium

[Rn] 5f7 6d1 7s2      

[Rn] 7s2 5f7 6d1      

9D2

Darmstadtium

[Rn] 5f14 6d9 7s1     

[Rn] 7s1 5f14 6d9     

Dubnium

[Rn] 5f14 6d3 7s2     

[Rn] 7s2 5f14 6d3     

4F3/2

Dysprosium

[Xe] 4f10 6s2         

[Xe] 6s2 4f10         

5I8

Einsteinium

[Rn] 5f11 7s2         

[Rn] 7s2 5f11         

4I15/2

Erbium

[Xe] 4f12 6s2         

[Xe] 6s2 4f12         

3H6

Europium

[Xe] 4f7 6s2          

[Xe] 6s2 4f7          

8S7/2

Fermium

[Rn] 5f12 7s2         

[Rn] 7s2 5f12         

3H6

Flerovium

[Rn] 5f14 6d10 7s2 7p2

[Rn] 7s2 5f14 6d10 7p2

Fluorine

[He] 2s2 2p5          

[He] 2s2 2p5          

2P3/2

Francium

[Rn] 7s1              

[Rn] 7s1              

2S1/2

Gadolinium

[Xe] 4f7 5d1 6s2      

[Xe] 6s2 4f7 5d1      

9D2

Gallium

[Ar] 3d10 4s2 4p1     

[Ar] 4s2 3d10 4p1     

2P1/2

Germanium

[Ar] 3d10 4s2 4p2     

[Ar] 4s2 3d10 4p2     

3P0

Gold

[Xe] 4f14 5d10 6s1    

[Xe] 6s1 4f14 5d10    

2S1/2

Hafnium

[Xe] 4f14 5d2 6s2     

[Xe] 6s2 4f14 5d2     

3F2

Hassium

[Rn] 5f14 6d6 7s2     

[Rn] 7s2 5f14 6d6     

5D4

Helium

1s2                   

1s2                   

1S0

Holmium

[Xe] 4f11 6s2         

[Xe] 6s2 4f11         

4I15/2

Hydrogen

1s1                   

1s1                   

2S1/2

Indium

[Kr] 4d10 5s2 5p1     

[Kr] 5s2 4d10 5p1     

2P1/2

Iodine

[Kr] 4d10 5s2 5p5     

[Kr] 5s2 4d10 5p5     

2P3/2

Iridium

[Xe] 4f14 5d7 6s2     

[Xe] 6s2 4f14 5d7     

4F9/2

Iron

[Ar] 3d6 4s2          

[Ar] 4s2 3d6          

5D4

Krypton

[Ar] 3d10 4s2 4p6     

[Ar] 4s2 3d10 4p6     

1S0

Lanthanum

[Xe] 5d1 6s2          

[Xe] 6s2 5d1          

2D3/2

Lawrencium

[Rn] 5f14 7s2 7p1     

[Rn] 7s2 5f14 7p1     

2P1/2

Lead

[Xe] 4f14 5d10 6s2 6p2

[Xe] 6s2 4f14 5d10 6p2

3P0

Lithium

[He] 2s1              

[He] 2s1              

2S1/2

Livermorium

[Rn] 5f14 6d10 7s2 7p4

[Rn] 7s2 5f14 6d10 7p4

Lutetium

[Xe] 4f14 5d1 6s2     

[Xe] 6s2 4f14 5d1     

2D3/2

Magnesium

[Ne] 3s2              

[Ne] 3s2              

1S0

Manganese

[Ar] 3d5 4s2          

[Ar] 4s2 3d5          

6S5/2

Meitnerium

[Rn] 5f14 6d7 7s2     

[Rn] 7s2 5f14 6d7     

4F9/2

Mendelevium

[Rn] 5f13 7s2         

[Rn] 7s2 5f13         

2F7/2

Mercury

[Xe] 4f14 5d10 6s2    

[Xe] 6s2 4f14 5d10    

1S0

Molybdenum

[Kr] 4d5 5s1          

[Kr] 5s1 4d5          

7S3

Neodymium

[Xe] 4f4 6s2          

[Xe] 6s2 4f4          

5I4

Neon

[He] 2s2 2p6          

[He] 2s2 2p6          

1S0

Neptunium

[Rn] 5f4 6d1 7s2      

[Rn] 7s2 5f4 6d1      

6L11/2

Nickel

[Ar] 3d8 4s2          

[Ar] 4s2 3d8          

3F4

Niobium

[Kr] 4d4 5s1          

[Kr] 5s1 4d4          

6D1/2

Nitrogen

[He] 2s2 2p3          

[He] 2s2 2p3          

4S3/2

Nobelium

[Rn] 5f14 7s2         

[Rn] 7s2 5f14         

1S0

Osmium

[Xe] 4f14 5d6 6s2     

[Xe] 6s2 4f14 5d6     

5D4

Oxygen

[He] 2s2 2p4          

[He] 2s2 2p4          

3P2

Palladium

[Kr] 4d10             

[Kr] 4d10             

1S0

Phosphorus

[Ne] 3s2 3p3          

[Ne] 3s2 3p3          

4S3/2

Platinum

[Xe] 4f14 5d9 6s1     

[Xe] 6s1 4f14 5d9     

3D3

Plutonium

[Rn] 5f6 7s2          

[Rn] 7s2 5f6          

7F0

Polonium

[Xe] 4f14 5d10 6s2 6p4

[Xe] 6s2 4f14 5d10 6p4

3P2

Potassium

[Ar] 4s1              

[Ar] 4s1              

2S1/2

Praseodymium

[Xe] 4f3 6s2          

[Xe] 6s2 4f3          

4I9/2

Promethium

[Xe] 4f5 6s2          

[Xe] 6s2 4f5          

6H5/2

Protactinium

[Rn] 5f2 6d1 7s2      

[Rn] 7s2 5f2 6d1      

4K11/2

Radium

[Rn] 7s2              

[Rn] 7s2              

1S0

Radon

[Xe] 4f14 5d10 6s2 6p6

[Xe] 6s2 4f14 5d10 6p6

1S0

Rhenium

[Xe] 4f14 5d5 6s2     

[Xe] 6s2 4f14 5d5     

6S5/2

Rhodium

[Kr] 4d8 5s1          

[Kr] 5s1 4d8          

4F9/2

Roentgenium

[Rn] 5f14 6d10 7s1    

[Rn] 7s1 5f14 6d10    

Rubidium

[Kr] 5s1              

[Kr] 5s1              

2S1/2

Ruthenium

[Kr] 4d7 5s1          

[Kr] 5s1 4d7          

5F5

Rutherfordium

[Rn] 5f14 6d2 7s2     

[Rn] 7s2 5f14 6d2     

3F2

Samarium

[Xe] 4f6 6s2          

[Xe] 6s2 4f6          

7F0

Scandium

[Ar] 3d1 4s2          

[Ar] 4s2 3d1          

2D3/2

Seaborgium

[Rn] 5f14 6d4 7s2     

[Rn] 7s2 5f14 6d4     

5D0

Selenium

[Ar] 3d10 4s2 4p4     

[Ar] 4s2 3d10 4p4     

3P2

Silicon

[Ne] 3s2 3p2          

[Ne] 3s2 3p2          

3P0

Silver

[Kr] 4d10 5s1         

[Kr] 5s1 4d10         

2S1/2

Sodium

[Ne] 3s1              

[Ne] 3s1              

2S1/2

Strontium

[Kr] 5s2              

[Kr] 5s2              

1S0

Sulfur

[Ne] 3s2 3p4          

[Ne] 3s2 3p4          

3P2

Tantalum

[Xe] 4f14 5d3 6s2     

[Xe] 6s2 4f14 5d3     

4F3/2

Technetium

[Kr] 4d5 5s2          

[Kr] 5s2 4d5          

6S5/2

Tellurium

[Kr] 4d10 5s2 5p4     

[Kr] 5s2 4d10 5p4     

3P2

Terbium

[Xe] 4f9 6s2          

[Xe] 6s2 4f9          

6H15/2

Thallium

[Xe] 4f14 5d10 6s2 6p1

[Xe] 6s2 4f14 5d10 6p1

2P1/2

Thorium

[Rn] 6d2 7s2          

[Rn] 7s2 6d2          

3F2

Thulium

[Xe] 4f13 6s2         

[Xe] 6s2 4f13         

2F7/2

Tin

[Kr] 4d10 5s2 5p2     

[Kr] 5s2 4d10 5p2     

3P0

Titanium

[Ar] 3d2 4s2          

[Ar] 4s2 3d2          

3F2

Tungsten

[Xe] 4f14 5d4 6s2     

[Xe] 6s2 4f14 5d4     

5D0

Uranium

[Rn] 5f3 6d1 7s2      

[Rn] 7s2 5f3 6d1      

5L6

Vanadium

[Ar] 3d3 4s2          

[Ar] 4s2 3d3          

4F3/2

Xenon

[Kr] 4d10 5s2 5p6     

[Kr] 5s2 4d10 5p6     

1S0

Ytterbium

[Xe] 4f14 6s2         

[Xe] 6s2 4f14         

1S0

Yttrium

[Kr] 4d1 5s2          

[Kr] 5s2 4d1          

2D3/2

Zinc

[Ar] 3d10 4s2         

[Ar] 4s2 3d10         

1S0

Zirconium

[Kr] 4d2 5s2          

[Kr] 5s2 4d2          

3F2

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

Emsley, John. The Elements, 3rd edition. Oxford: Oxford University Press, 1998.

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.

Liboff, Richard L. Introductory Quantum Mechanics, 3rd edition. Reading, MA: Addison Wesley Longman, Inc., 1998.

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.

Oxtoby, David W., H. P. Gillis, and Alan Campion. Principles of Modern Chemistry, 6th edition. Belmont, CA: Thomson Brooks/Cole, 2008.

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

Silbey, Robert J., Robert A. Alberty, and Moungi G. Bawendi. Physical Chemistry, 4th edition. Hoboken, NJ: John Wiley & Sons, Inc., 2005.