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The Electron Configurations of the Elements

The distribution of the individual electrons in different energy states.

The electron configuration of a chemical element describes the distribution of electrons among the various atomic orbitals or energy states of an atom.

 

Table: Electron Configurations

The list below shows the individual electron distributions in the uncharged atoms of the chemical elements in the long form. The s orbitals and the noble gases are highlighted in yellow as a guide.

It means: Z = atomic number; S = chemical symbol.

ZElementS1s2s2p3s3p3d4s4p4d4f5s5p5d5f6s6p6d6f7s7p
1Hydrogen
1s1
H1
2Helium
1s2
He2
3Lithium
[He] 2s1
Li21
4Beryllium
[He] 2s2
Be22
5Boron
[He] 2s2 2p1
B221
6Carbon
[He] 2s2 2p2
C222
7Nitrogen
[He] 2s2 2p3
N223
8Oxygen
[He] 2s2 2p4
O224
9Fluorine
[He] 2s2 2p5
F225
10Neon
[He] 2s2 2p6
Ne226
11Sodium
[Ne] 3s1
Na2261
12Magnesium
[Ne] 3s2
Mg2262
13Aluminium
[Ne] 3s2 3p1
Al22621
14Silicon
[Ne] 3s2 3p2
Si22622
15Phosphorus
[Ne] 3s2 3p3
P22623
16Sulfur
[Ne] 3s2 3p4
S22624
17Chlorine
[Ne] 3s2 3p5
Cl22625
18Argon
[Ne] 3s2 3p6
Ar22626
19Potassium
[Ar] 4s1
K226261
20Calcium
[Ar] 4s2
Ca226262
21Scandium
[Ar] 3d1 4s2
Sc2262612
22Titanium
[Ar] 3d2 4s2
Ti2262622
23Vanadium
[Ar] 3d3 4s2
V2262632
24Chromium
[Ar] 3d5 4s1
Cr2262651
25Manganese
[Ar] 3d5 4s2
Mn2262652
26Iron
[Ar] 3d6 4s2
Fe2262662
27Cobalt
[Ar] 3d7 4s2
Co2262672
28Nickel
[Ar] 3d8 4s2
Ni2262682
29Copper
[Ar] 3d10 4s1
Cu22626101
30Zinc
[Ar] 3d10 4s2
Zn22626102
31Gallium
[Ar] 3d10 4s2 4p1
Ga226261021
32Germanium
[Ar] 3d10 4s2 4p2
Ge226261022
33Arsenic
[Ar] 3d10 4s2 4p3
As226261023
34Selenium
[Ar] 3d10 4s2 4p4
Se226261024
35Bromine
[Ar] 3d10 4s2 4p5
Br226261025
36Krypton
[Ar] 3d10 4s2 4p6
Kr226261026
37Rubidium
[Kr] 5s1
Rb2262610261
38Strontium
[Kr] 5s2
Sr2262610262
39Yttrium
[Kr] 4d1 5s2
Y22626102612
40Zirconium
[Kr] 4d2 5s2
Zr22626102622
41Niobium
[Kr] 4d4 5s1
Nb22626102641
42Molybdenum
[Kr] 4d5 5s1
Mo22626102651
43Technetium
[Kr] 4d6 5s1
Tc22626102661
44Ruthenium
[Kr] 4d7 5s1
Ru22626102671
45Rhodium
[Kr] 4d8 5s1
Rh22626102681
46Palladium
[Kr] 4d10
Pd22626102610..
47Silver
[Kr] 4d10 5s1
Ag226261026101
48Cadmium
[Kr] 4d10 5s2
Cd226261026102
49Indium
[Kr] 4d10 5s2 5p1
In2262610261021
50Tin
[Kr] 4d10 5s2 5p2
Sn2262610261022
51Antimony
[Kr] 4d10 5s2 5p3
Sb2262610261023
52Tellurium
[Kr] 4d10 5s2 5p4
Te2262610261024
53Iodine
[Kr] 4d10 5s2 5p5
I2262610261025
54Xenon
[Kr] 4d10 5s2 5p6
Xe2262610261026
55Cesium
[Xe] 6s1
Cs22626102610261
56Barium
[Xe] 6s2
Ba22626102610262
57Lanthanum
[Xe] 5d1 6s2
La226261026102612
58Cerium
[Xe] 4f1 5d16s2
Ce2262610261012612
59Praseodymium
[Xe] 4f3 6s2
Pr22626102610326 2
60Neodymium
[Xe] 4f4 6s2
Nd22626102610426 2
61Promethium
[Xe] 4f5 6s2
Pm22626102610526 2
62Samarium
[Xe] 4f6 6s2
Sm22626102610626 2
63Europium
[Xe] 4f7 6s2
Eu22626102610726 2
64Gadolinium
[Xe] 4f7 5d1 6s2
Gd2262610261072612
65Terbium
[Xe] 4f9 6s2
Tb226261026109262
66Dysprosium
[Xe] 4f10 6s2
Dy2262610261010262
67Holmium
[Xe] 4f11 6s2
Ho2262610261011262
68Erbium
[Xe] 4f12 6s2
Er2262610261012262
69Thulium
[Xe] 4f13 6s2
Tm2262610261013262
70Ytterbium
[Xe] 4f14 6s2
Yb2262610261014262
71Lutetium
[Xe] 4f14 5d1 6s2
Lu22626102610142612
72Hafnium
[Xe] 4f14 5d2 6s2
Hf22626102610142622
73Tantalum
[Xe] 4f14 5d3 6s2
Ta22626102610142632
74Tungsten
[Xe] 4f14 5d4 6s2
W22626102610142642
75Rhenium
[Xe] 4f14 5d5 6s2
Re22626102610142652
76Osmium
[Xe] 4f14 5d6 6s2
Os22626102610142662
77Iridium
[Xe] 4f14 5d7 6s2
Ir22626102610142672
78Platinum
[Xe] 4f14 5d9 6s1
Pt22626102610142691
79Gold
[Xe] 4f14 5d10 6s1
Au226261026101426101
80Mercury
[Xe] 4f14 5d10 6s2
Hg226261026101426102
81Thallium
[Xe] 4f14 5d10 6s2 6p1
Tl2262610261014261021
82Lead
[Xe] 4f14 5d10 6s2 6p2
Pb2262610261014261022
83Bismuth
[Xe] 4f14 5d10 6s2 6p3
Bi2262610261014261023
84Polonium
[Xe] 4f14 5d10 6s2 6p4
Po2262610261014261024
85Astatine
[Xe] 4f14 5d10 6s2 6p5
At2262610261014261025
86Radon
[Xe] 4f14 5d10 6s2 6p6
Rn2262610261014261026
87Francium
[Rn] 7s1
Fr22626102610142610261
88Radium
[Rn] 7s2
Ra22626102610142610262
89Actinium
[Rn] 6d1 7s2
Ac226261026101426102612
90Thorium
[Rn] 6d2 7s2
Th226261026101426102622
91Protactinium
[Rn] 5f2 6d1 7s2
Pa2262610261014261022612
92Uranium
[Rn] 5f3 6d1 7s2
U2262610261014261032612
93Neptunium
[Rn] 5f4 6d1 7s2
Np2262610261014261042612
94Plutonium
[Rn] 5f6 7s2
Pu226261026101426106262
95Americium
[Rn] 5f7 7s2
Am226261026101426107262
96Curium
[Rn] 5f7 6d1 7s2
Cm2262610261014261072612
97Berkelium
[Rn] 5f9 7s2
Bk226261026101426109262
98Californium
[Rn] 5f10 7s2
Cf2262610261014261010262
99Einsteinium
[Rn] 5f11 7s2
Es2262610261014261011262
100Fermium
[Rn] 5f12 7s2
Fm2262610261014261012262
101Mendelevium
[Rn] 5f13 7s2
Md2262610261014261013262
102Nobelium
[Rn] 5f14 7s2
No2262610261014261014262
103Lawrencium
[Rn] 5f14 6d1 7s2
Lr22626102610142610142612
104Rutherfordium
[Rn] 5f14 6d2 7s2
Rf22626102610142610142622
105Dubnium
[Rn] 5f14 6d3 7s2
Db22626102610142610142632
106Seaborgium
[Rn] 5f14 6d4 7s2
Sg22626102610142610142642
107Bohrium
[Rn] 5f14 6d5 7s2
Bh22626102610142610142652
108Hassium
[Rn] 5f14 6d6 7s2
Hs22626102610142610142662
109Meitnerium
[Rn] 5f14 6d7 7s2
Mt22626102610142610142672
110Darmstadtium
[Rn] 5f14 6d9 7s1
Ds22626102610142610142691
111Roentgenium
[Rn] 5f14 6d10 7s1
Rg226261026101426101426101
112Copernicium
[Rn] 5f14 6d10 7s2
Cn226261026101426101426102
113Nihonium
[Rn] 5f14 6d10 7s2 7p1
Nh2262610261014261014261021
114Flerovium
[Rn] 5f14 6d10 7s2 7p2
Fl2262610261014261014261022
115Moscovium
[Rn] 5f14 6d10 7s2 7p3
Mc2262610261014261014261023
116Livermorium
[Rn] 5f14 6d10 7s2 7p4
Lv2262610261014261014261024
117Tennessine
[Rn] 5f14 6d10 7s2 7p5
Ts2262610261014261014261025
118Oganesson
[Rn] 5f14 6d10 7s2 7p6
Og2262610261014261014261026