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A1: Atomic Electron Configurations

  • Page ID
    2180
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    Electron configurations of the neutral gaseous atoms in the ground state. Given by subshells in concise form, by subshells written out, and by number of electrons per shell.

    1 H hydrogen : 1s1
    1s1
    1
    2 He helium : 1s2
    1s2
    2
    3 Li lithium : 1s2 2s1
    1s2 2s1
    2 1
    4 Be beryllium : 1s2 2s2
    1s2 2s2
    2 2
    5 B boron : 1s2 2s2 2p1
    1s2 2s2 2p1
    2 3
    6 C carbon : 1s2 2s2 2p2
    1s2 2s2 2p2
    2 4
    7 N nitrogen : 1s2 2s2 2p3
    1s2 2s2 2p3
    2 5
    8 O oxygen : 1s2 2s2 2p4
    1s2 2s2 2p4
    2 6
    9 F fluorine : 1s2 2s2 2p5
    1s2 2s2 2p5
    2 7
    10 Ne neon : 1s2 2s2 2p6
    1s2 2s2 2p6
    2 8
    11 Na sodium : [Ne] 3s1
    1s2 2s2 2p6 3s1
    2 8 1
    12 Mg magnesium : [Ne] 3s2
    1s2 2s2 2p6 3s2
    2 8 2
    13 Al aluminium : [Ne] 3s2 3p1
    1s2 2s2 2p6 3s2 3p1
    2 8 3
    14 Si silicon : [Ne] 3s2 3p2
    1s2 2s2 2p6 3s2 3p2
    2 8 4
    15 P phosphorus : [Ne] 3s2 3p3
    1s2 2s2 2p6 3s2 3p3
    2 8 5
    16 S sulfur : [Ne] 3s2 3p4
    1s2 2s2 2p6 3s2 3p4
    2 8 6
    17 Cl chlorine : [Ne] 3s2 3p5
    1s2 2s2 2p6 3s2 3p5
    2 8 7
    18 Ar argon : [Ne] 3s2 3p6
    1s2 2s2 2p6 3s2 3p6
    2 8 8
    19 K potassium : [Ar] 4s1
    1s2 2s2 2p6 3s2 3p6 4s1
    2 8 8 1
    20 Ca calcium : [Ar] 4s2
    1s2 2s2 2p6 3s2 3p6 4s2
    2 8 8 2
    21 Sc scandium : [Ar] 3d1 4s2
    1s2 2s2 2p6 3s2 3p6 3d1 4s2
    2 8 9 2
    22 Ti titanium : [Ar] 3d2 4s2
    1s2 2s2 2p6 3s2 3p6 3d2 4s2
    2 8 10 2
    23 V vanadium : [Ar] 3d3 4s2
    1s2 2s2 2p6 3s2 3p6 3d3 4s2
    2 8 11 2
    24 Cr chromium : [Ar] 3d5 4s1
    1s2 2s2 2p6 3s2 3p6 3d5 4s1
    2 8 13 1
    25 Mn manganese : [Ar] 3d5 4s2
    1s2 2s2 2p6 3s2 3p6 3d5 4s2
    2 8 13 2
    26 Fe iron : [Ar] 3d6 4s2
    1s2 2s2 2p6 3s2 3p6 3d6 4s2
    2 8 14 2
    27 Co cobalt : [Ar] 3d7 4s2
    1s2 2s2 2p6 3s2 3p6 3d7 4s2
    2 8 15 2
    28 Ni : [Ar] 3d8 4s2
    1s2 2s2 2p6 3s2 3p6 3d8 4s2
    2 8 16 2
    29 Cu : [Ar] 3d10 4s1
    1s2 2s2 2p6 3s2 3p6 3d10 4s1
    2 8 18 1
    30 Zn : [Ar] 3d10 4s2
    1s2 2s2 2p6 3s2 3p6 3d10 4s2
    2 8 18 2
    31 Ga : [Ar] 3d10 4s2 4p1
    1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p1
    2 8 18 3
    32 Ge : [Ar] 3d10 4s2 4p2
    1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p2
    2 8 18 4
    33 As : [Ar] 3d10 4s2 4p3
    1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p3
    2 8 18 5
    34 Se : [Ar] 3d10 4s2 4p4
    1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p4
    2 8 18 6
    35 Br : [Ar] 3d10 4s2 4p5
    1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p5
    2 8 18 7
    36 Kr krypton : [Ar] 3d10 4s2 4p6
    1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6
    2 8 18 8
    37 Rb : [Kr] 5s1
    1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 5s1
    2 8 18 8 1
    38 Sr strontium : [Kr] 5s2
    1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 5s2
    2 8 18 8 2
    39 Y yttrium : [Kr] 4d1 5s2
    1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d1 5s2
    2 8 18 9 2
    40 Zr zirconium : [Kr] 4d2 5s2
    1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d2 5s2
    2 8 18 10 2
    41 Nb niobium : [Kr] 4d4 5s1
    1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d4 5s1
    2 8 18 12 1
    42 Mo molybdenum : [Kr] 4d5 5s1
    1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d5 5s1
    2 8 18 13 1
    43 Tc technetium : [Kr] 4d5 5s2
    1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d5 5s2
    2 8 18 13 2
    44 Ru ruthenium : [Kr] 4d7 5s1
    1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d7 5s1
    2 8 18 15 1
    45 Rh rhodium : [Kr] 4d8 5s1
    1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d8 5s1
    2 8 18 16 1
    46 Pd palladium : [Kr] 4d10
    1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10
    2 8 18 18
    47 Ag silver : [Kr] 4d10 5s1
    1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 5s1
    2 8 18 18 1
    48 Cd cadmium : [Kr] 4d10 5s2
    1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 5s2
    2 8 18 18 2
    49 In indium : [Kr] 4d10 5s2 5p1
    1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 5s2 5p1
    2 8 18 18 3
    50 Sn tin : [Kr] 4d10 5s2 5p2
    1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 5s2 5p2
    2 8 18 18 4
    51 Sb antimony : [Kr] 4d10 5s2 5p3
    1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 5s2 5p3
    2 8 18 18 5
    52 Te tellurium : [Kr] 4d10 5s2 5p4
    1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 5s2 5p4
    2 8 18 18 6
    53 I iodine : [Kr] 4d10 5s2 5p5
    1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 5s2 5p5
    2 8 18 18 7
    54 Xe xenon : [Kr] 4d10 5s2 5p6
    1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 5s2 5p6
    2 8 18 18 8
    55 Cs caesium : [Xe] 6s1
    1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 5s2 5p6 6s1
    2 8 18 18 8 1
    56 Ba barium : [Xe] 6s2
    1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 5s2 5p6 6s2
    2 8 18 18 8 2
    57 La lanthanum : [Xe] 5d1 6s2
    1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 5s2 5p6 5d1 6s2
    2 8 18 18 9 2
    58 Ce cerium : [Xe] 4f1 5d1 6s2
    1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 4f1 5s2 5p6 5d1 6s2
    2 8 18 19 9 2
    59 Pr praseodymium : [Xe] 4f3 6s2
    1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 4f3 5s2 5p6 6s2
    2 8 18 21 8 2
    60 Nd neodymium : [Xe] 4f4 6s2
    1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 4f4 5s2 5p6 6s2
    2 8 18 22 8 2
    61 Pm promethium : [Xe] 4f5 6s2
    1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 4f5 5s2 5p6 6s2
    2 8 18 23 8 2
    62 Sm samarium : [Xe] 4f6 6s2
    1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 4f6 5s2 5p6 6s2
    2 8 18 24 8 2
    63 Eu europium : [Xe] 4f7 6s2
    1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 4f7 5s2 5p6 6s2
    2 8 18 25 8 2
    64 Gd gadolinium : [Xe] 4f7 5d1 6s2
    1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 4f7 5s2 5p6 5d1 6s2
    2 8 18 25 9 2
    65 Tb terbium : [Xe] 4f9 6s2
    1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 4f9 5s2 5p6 6s2
    2 8 18 27 8 2
    66 Dy dysprosium : [Xe] 4f10 6s2
    1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 4f10 5s2 5p6 6s2
    2 8 18 28 8 2
    67 Ho holmium : [Xe] 4f11 6s2
    1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 4f11 5s2 5p6 6s2
    2 8 18 29 8 2
    68 Er erbium : [Xe] 4f12 6s2
    1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 4f12 5s2 5p6 6s2
    2 8 18 30 8 2
    69 Tm thulium : [Xe] 4f13 6s2
    1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 4f13 5s2 5p6 6s2
    2 8 18 31 8 2
    70 Yb ytterbium : [Xe] 4f14 6s2
    1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 4f14 5s2 5p6 6s2
    2 8 18 32 8 2
    71 Lu lutetium : [Xe] 4f14 5d1 6s2
    1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 4f14 5s2 5p6 5d1 6s2
    2 8 18 32 9 2
    72 Hf hafnium : [Xe] 4f14 5d2 6s2
    1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 4f14 5s2 5p6 5d2 6s2
    2 8 18 32 10 2
    73 Ta tantalum : [Xe] 4f14 5d3 6s2
    1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 4f14 5s2 5p6 5d3 6s2
    2 8 18 32 11 2
    74 W tungsten : [Xe] 4f14 5d4 6s2
    1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 4f14 5s2 5p6 5d4 6s2
    2 8 18 32 12 2
    75 Re rhenium : [Xe] 4f14 5d5 6s2
    1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 4f14 5s2 5p6 5d5 6s2
    2 8 18 32 13 2
    76 Os osmium : [Xe] 4f14 5d6 6s2
    1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 4f14 5s2 5p6 5d6 6s2
    2 8 18 32 14 2
    77 Ir iridium : [Xe] 4f14 5d7 6s2
    1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 4f14 5s2 5p6 5d7 6s2
    2 8 18 32 15 2
    78 Pt platinum : [Xe] 4f14 5d9 6s1
    1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 4f14 5s2 5p6 5d9 6s1
    2 8 18 32 17 1
    79 Au gold : [Xe] 4f14 5d10 6s1
    1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 4f14 5s2 5p6 5d10 6s1
    2 8 18 32 18 1
    80 Hg mercury : [Xe] 4f14 5d10 6s2
    1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 4f14 5s2 5p6 5d10 6s2
    2 8 18 32 18 2
    81 Tl thallium : [Xe] 4f14 5d10 6s2 6p1
    1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 4f14 5s2 5p6 5d10 6s2 6p1
    2 8 18 32 18 3
    82 Pb lead : [Xe] 4f14 5d10 6s2 6p2
    1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 4f14 5s2 5p6 5d10 6s2 6p2
    2 8 18 32 18 4
    83 Bi bismuth : [Xe] 4f14 5d10 6s2 6p3
    1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 4f14 5s2 5p6 5d10 6s2 6p3
    2 8 18 32 18 5
    84 Po polonium : [Xe] 4f14 5d10 6s2 6p4
    1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 4f14 5s2 5p6 5d10 6s2 6p4
    2 8 18 32 18 6
    85 At astatine : [Xe] 4f14 5d10 6s2 6p5
    1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 4f14 5s2 5p6 5d10 6s2 6p5
    2 8 18 32 18 7
    86 Rn radon : [Xe] 4f14 5d10 6s2 6p6
    1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 4f14 5s2 5p6 5d10 6s2 6p6
    2 8 18 32 18 8
    87 Fr francium : [Rn] 7s1
    1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 4f14 5s2 5p6 5d10 6s2 6p6 7s1
    2 8 18 32 18 8 1
    88 Ra radium : [Rn] 7s2
    1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 4f14 5s2 5p6 5d10 6s2 6p6 7s2
    2 8 18 32 18 8 2
    89 Ac actinium : [Rn] 6d1 7s2
    1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 4f14 5s2 5p6 5d10 6s2 6p6 6d1 7s2
    2 8 18 32 18 9 2
    90 Th thorium : [Rn] 6d2 7s2
    1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 4f14 5s2 5p6 5d10 6s2 6p6 6d2 7s2
    2 8 18 32 18 10 2
    91 Pa protactinium : [Rn] 5f2 6d1 7s2
    1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 4f14 5s2 5p6 5d10 5f2 6s2 6p6 6d1 7s2
    2 8 18 32 20 9 2
    92 U uranium : [Rn] 5f3 6d1 7s2
    1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 4f14 5s2 5p6 5d10 5f3 6s2 6p6 6d1 7s2
    2 8 18 32 21 9 2
    93 Np neptunium : [Rn] 5f4 6d1 7s2
    1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 4f14 5s2 5p6 5d10 5f4 6s2 6p6 6d1 7s2
    2 8 18 32 22 9 2
    94 Pu plutonium : [Rn] 5f6 7s2
    1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 4f14 5s2 5p6 5d10 5f6 6s2 6p6 7s2
    2 8 18 32 24 8 2
    95 Am americium : [Rn] 5f7 7s2
    1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 4f14 5s2 5p6 5d10 5f7 6s2 6p6 7s2
    2 8 18 32 25 8 2
    96 Cm curium : [Rn] 5f7 6d1 7s2
    1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 4f14 5s2 5p6 5d10 5f7 6s2 6p6 6d1 7s2
    2 8 18 32 25 9 2
    97 Bk berkelium : [Rn] 5f9 7s2
    1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 4f14 5s2 5p6 5d10 5f9 6s2 6p6 7s2
    2 8 18 32 27 8 2
    98 Cf californium : [Rn] 5f10 7s2
    1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 4f14 5s2 5p6 5d10 5f10 6s2 6p6 7s2
    2 8 18 32 28 8 2
    99 Es einsteinium : [Rn] 5f11 7s2
    1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 4f14 5s2 5p6 5d10 5f11 6s2 6p6 7s2
    2 8 18 32 29 8 2
    100 Fm fermium : [Rn] 5f12 7s2
    1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 4f14 5s2 5p6 5d10 5f12 6s2 6p6 7s2
    2 8 18 32 30 8 2
    101 Md mendelevium : [Rn] 5f13 7s2
    1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 4f14 5s2 5p6 5d10 5f13 6s2 6p6 7s2
    2 8 18 32 31 8 2
    102 No nobelium : [Rn] 5f14 7s2
    1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 4f14 5s2 5p6 5d10 5f14 6s2 6p6 7s2
    2 8 18 32 32 8 2
    103 Lr lawrencium : probably [Rn] 5f14 7s2 7p1
    1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 4f14 5s2 5p6 5d10 5f14 6s2 6p6 7s2 7p1
    2 8 18 32 32 8 3
    104 Rf rutherfordium : probably [Rn] 5f14 6d2 7s2
    1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 4f14 5s2 5p6 5d10 5f14 6s2 6p6 6d2 7s2
    2 8 18 32 32 10 2

    References

    All sources concur with the data above except in the separately listed instances:

    NIST

    • ; retrieved July 2005, (elements 1–104) based on:
      • Atomic Spectroscopy, by W.C. Martin and W.L. Wiese in Atomic, Molecular, & Optical Physics Handbook, ed. by G.W.F. Drake (AIP, Woodbury, NY, 1996) Chapter 10, pp. 135–153.

    This website is also cited in the CRC Handbook as source of Section 1, subsection Electron Configuration of Neutral Atoms in the Ground State.

    • 91 Pa : [Rn] 5f2(3H4) 6d 7s2
    • 92 U : [Rn] 5f3(4Io9/2) 6d 7s2
    • 93 Np : [Rn] 5f4(5I4) 6d 7s2
    • 103 Lr : [Rn] 5f14 7s2 7p1 question-marked
    • 104 Rf : [Rn] 5f14 6d2 7s2 question-marked

    CRC

    • David R. Lide (ed), CRC Handbook of Chemistry and Physics, 84th Edition, online version. CRC Press. Boca Raton, Florida, 2003; Section 1, Basic Constants, Units, and Conversion Factors; Electron Configuration of Neutral Atoms in the Ground State. (elements 1–104)
    • Also subsection Periodic Table of the Elements, (elements 1–103) based on:
      • G. J. Leigh, Editor, Nomenclature of Inorganic Chemistry, Blackwell Scientific Publications, Oxford, 1990.
      • Chemical and Engineering News, 63(5), 27, 1985.
      • Atomic Weights of the Elements, 1999, Pure & Appl. Chem., 73, 667, 2001.

    References

    • en.Wikipedia.org/wiki/Electro...28data_page%29

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