Electron configurations of the elements ( data page ) - wikipedia Electron configurations of the elements ( data page ) Main article : Electron configuration This page shows the electron configurations of the neutral gaseous atoms in their ground states. For each atom the subshells are given first in concise form, then with all subshells written out, followed by the number of electrons per shell. Electron configurations of elements beyond hassium ( element 108 ) are predicted. As an approximate rule, electron configurations are given by the Aufbau principle and the Madelung rule. However there are numerous exceptions ; for example the lightest exception is chromium, which would be predicted to have the configuration 1s 2s 2p 3s 3p 3d 4s, written as ( Ar ) 3d 4s, but whose actual configuration given in the table below is ( Ar ) 3d 4s. Legend 1s 2s 2p 3s 3p 3d 4s 4p 4d 4f 5s 5p 5d 5f 5g 6s 6p 6d 6f 7s 7p 7d 8s 8p 9s 9p 1 H hydrogen : 1s 1s 2 He helium : 1s 1s 3 Li lithium : ( He ) 2s 1s 2s 4 Be beryllium : ( He ) 2s 1s 2s 5 B boron : ( He ) 2s 2p 1s 2s 2p 6 C carbon : ( He ) 2s 2p 1s 2s 2p 7 N nitrogen : ( He ) 2s 2p 1s 2s 2p 5 8 O oxygen : ( He ) 2s 2p 1s 2s 2p 6 9 F fluorine : ( He ) 2s 2p 1s 2s 2p 7 10 Ne neon : ( He ) 2s 2p 1s 2s 2p 8 11 Na sodium : ( Ne ) 3s 1s 2s 2p 3s 8 12 Mg magnesium : ( Ne ) 3s 1s 2s 2p 3s 8 13 Al aluminium : ( Ne ) 3s 3p 1s 2s 2p 3s 3p 8 14 Si silicon : ( Ne ) 3s 3p 1s 2s 2p 3s 3p 8 15 P phosphorus : ( Ne ) 3s 3p 1s 2s 2p 3s 3p 8 5 16 S sulfur : ( Ne ) 3s 3p 1s 2s 2p 3s 3p 8 6 17 Cl chlorine : ( Ne ) 3s 3p 1s 2s 2p 3s 3p 8 7 18 Ar argon : ( Ne ) 3s 3p 1s 2s 2p 3s 3p 8 8 19 K potassium : ( Ar ) 4s 1s 2s 2p 3s 3p 4s 8 8 20 Ca calcium : ( Ar ) 4s 1s 2s 2p 3s 3p 4s 8 8 21 Sc scandium : ( Ar ) 3d 4s 1s 2s 2p 3s 3p 3d 4s 8 9 22 Ti titanium : ( Ar ) 3d 4s 1s 2s 2p 3s 3p 3d 4s 8 10 23 V vanadium : ( Ar ) 3d 4s 1s 2s 2p 3s 3p 3d 4s 8 11 24 Cr chromium : ( Ar ) 3d 4s 1s 2s 2p 3s 3p 3d 4s 8 13 25 Mn manganese : ( Ar ) 3d 4s 1s 2s 2p 3s 3p 3d 4s 8 13 26 Fe iron : ( Ar ) 3d 4s 1s 2s 2p 3s 3p 3d 4s 8 14 27 Co cobalt : ( Ar ) 3d 4s 1s 2s 2p 3s 3p 3d 4s 8 15 28 Ni nickel : ( Ar ) 3d 4s 1s 2s 2p 3s 3p 3d 4s 8 16 29 Cu copper : ( Ar ) 3d 4s 1s 2s 2p 3s 3p 3d 4s 8 18 30 Zn zinc : ( Ar ) 3d 4s 1s 2s 2p 3s 3p 3d 4s 8 18 31 Ga gallium : ( Ar ) 3d 4s 4p 1s 2s 2p 3s 3p 3d 4s 4p 8 18 32 Ge germanium : ( Ar ) 3d 4s 4p 1s 2s 2p 3s 3p 3d 4s 4p 8 18 33 As arsenic : ( Ar ) 3d 4s 4p 1s 2s 2p 3s 3p 3d 4s 4p 8 18 5 34 Se selenium : ( Ar ) 3d 4s 4p 1s 2s 2p 3s 3p 3d 4s 4p 8 18 6 35 Br bromine : ( Ar ) 3d 4s 4p 1s 2s 2p 3s 3p 3d 4s 4p 8 18 7 36 Kr krypton : ( Ar ) 3d 4s 4p 1s 2s 2p 3s 3p 3d 4s 4p 8 18 8 37 Rb rubidium : ( Kr ) 5s 1s 2s 2p 3s 3p 3d 4s 4p 5s 8 18 8 38 Sr strontium : ( Kr ) 5s 1s 2s 2p 3s 3p 3d 4s 4p 5s 8 18 8 39 Y yttrium : ( Kr ) 4d 5s 1s 2s 2p 3s 3p 3d 4s 4p 4d 5s 8 18 9 40 Zr zirconium : ( Kr ) 4d 5s 1s 2s 2p 3s 3p 3d 4s 4p 4d 5s 8 18 10 41 Nb niobium : ( Kr ) 4d 5s 1s 2s 2p 3s 3p 3d 4s 4p 4d 5s 8 18 12 42 Mo molybdenum : ( Kr ) 4d 5s 1s 2s 2p 3s 3p 3d 4s 4p 4d 5s 8 18 13 43 Tc technetium : ( Kr ) 4d 5s 1s 2s 2p 3s 3p 3d 4s 4p 4d 5s 8 18 13 44 Ru ruthenium : ( Kr ) 4d 5s 1s 2s 2p 3s 3p 3d 4s 4p 4d 5s 8 18 15 45 Rh rhodium : ( Kr ) 4d 5s 1s 2s 2p 3s 3p 3d 4s 4p 4d 5s 8 18 16 46 Pd palladium : ( Kr ) 4d 1s 2s 2p 3s 3p 3d 4s 4p 4d 8 18 18 47 Ag silver : ( Kr ) 4d 5s 1s 2s 2p 3s 3p 3d 4s 4p 4d 5s 8 18 18 48 Cd cadmium : ( Kr ) 4d 5s 1s 2s 2p 3s 3p 3d 4s 4p 4d 5s 8 18 18 49 In indium : ( Kr ) 4d 5s 5p 1s 2s 2p 3s 3p 3d 4s 4p 4d 5s 5p 8 18 18 50 Sn tin : ( Kr ) 4d 5s 5p 1s 2s 2p 3s 3p 3d 4s 4p 4d 5s 5p 8 18 18 51 Sb antimony : ( Kr ) 4d 5s 5p 1s 2s 2p 3s 3p 3d 4s 4p 4d 5s 5p 8 18 18 5 52 Te tellurium : ( Kr ) 4d 5s 5p 1s 2s 2p 3s 3p 3d 4s 4p 4d 5s 5p 8 18 18 6 53 I iodine : ( Kr ) 4d 5s 5p 1s 2s 2p 3s 3p 3d 4s 4p 4d 5s 5p 8 18 18 7 54 Xe xenon : ( Kr ) 4d 5s 5p 1s 2s 2p 3s 3p 3d 4s 4p 4d 5s 5p 8 18 18 8 55 Cs caesium : ( Xe ) 6s 1s 2s 2p 3s 3p 3d 4s 4p 4d 5s 5p 6s 8 18 18 8 56 Ba barium : ( Xe ) 6s 1s 2s 2p 3s 3p 3d 4s 4p 4d 5s 5p 6s 8 18 18 8 57 La lanthanum : ( Xe ) 5d 6s 1s 2s 2p 3s 3p 3d 4s 4p 4d 5s 5p 5d 6s 8 18 18 9 58 Ce cerium : ( Xe ) 4f 5d 6s 1s 2s 2p 3s 3p 3d 4s 4p 4d 4f 5s 5p 5d 6s 8 18 19 9 59 Pr praseodymium : ( Xe ) 4f 6s 1s 2s 2p 3s 3p 3d 4s 4p 4d 4f 5s 5p 6s 8 18 21 8 60 Nd neodymium : ( Xe ) 4f 6s 1s 2s 2p 3s 3p 3d 4s 4p 4d 4f 5s 5p 6s 8 18 22 8 61 Pm promethium : ( Xe ) 4f 6s 1s 2s 2p 3s 3p 3d 4s 4p 4d 4f 5s 5p 6s 8 18 23 8 62 Sm samarium : ( Xe ) 4f 6s 1s 2s 2p 3s 3p 3d 4s 4p 4d 4f 5s 5p 6s 8 18 24 8 63 Eu europium : ( Xe ) 4f 6s 1s 2s 2p 3s 3p 3d 4s 4p 4d 4f 5s 5p 6s 8 18 25 8 64 Gd gadolinium : ( Xe ) 4f 5d 6s 1s 2s 2p 3s 3p 3d 4s 4p 4d 4f 5s 5p 5d 6s 8 18 25 9 65 Tb terbium : ( Xe ) 4f 6s 1s 2s 2p 3s 3p 3d 4s 4p 4d 4f 5s 5p 6s 8 18 27 8 66 Dy dysprosium : ( Xe ) 4f 6s 1s 2s 2p 3s 3p 3d 4s 4p 4d 4f 5s 5p 6s 8 18 28 8 67 Ho holmium : ( Xe ) 4f 6s 1s 2s 2p 3s 3p 3d 4s 4p 4d 4f 5s 5p 6s 8 18 29 8 68 Er erbium : ( Xe ) 4f 6s 1s 2s 2p 3s 3p 3d 4s 4p 4d 4f 5s 5p 6s 8 18 30 8 69 Tm thulium : ( Xe ) 4f 6s 1s 2s 2p 3s 3p 3d 4s 4p 4d 4f 5s 5p 6s 8 18 31 8 70 Yb ytterbium : ( Xe ) 4f 6s 1s 2s 2p 3s 3p 3d 4s 4p 4d 4f 5s 5p 6s 8 18 32 8 71 Lu lutetium : ( Xe ) 4f 5d 6s 1s 2s 2p 3s 3p 3d 4s 4p 4d 4f 5s 5p 5d 6s 8 18 32 9 72 Hf hafnium : ( Xe ) 4f 5d 6s 1s 2s 2p 3s 3p 3d 4s 4p 4d 4f 5s 5p 5d 6s 8 18 32 10 73 Ta tantalum : ( Xe ) 4f 5d 6s 1s 2s 2p 3s 3p 3d 4s 4p 4d 4f 5s 5p 5d 6s 8 18 32 11 74 W tungsten : ( Xe ) 4f 5d 6s 1s 2s 2p 3s 3p 3d 4s 4p 4d 4f 5s 5p 5d 6s 8 18 32 12 75 Re rhenium : ( Xe ) 4f 5d 6s 1s 2s 2p 3s 3p 3d 4s 4p 4d 4f 5s 5p 5d 6s 8 18 32 13 76 Os osmium : ( Xe ) 4f 5d 6s 1s 2s 2p 3s 3p 3d 4s 4p 4d 4f 5s 5p 5d 6s 8 18 32 14 77 Ir iridium : ( Xe ) 4f 5d 6s 1s 2s 2p 3s 3p 3d 4s 4p 4d 4f 5s 5p 5d 6s 8 18 32 15 78 Pt platinum : ( Xe ) 4f 5d 6s 1s 2s 2p 3s 3p 3d 4s 4p 4d 4f 5s 5p 5d 6s 8 18 32 17 79 Au gold : ( Xe ) 4f 5d 6s 1s 2s 2p 3s 3p 3d 4s 4p 4d 4f 5s 5p 5d 6s 8 18 32 18 80 Hg mercury : ( Xe ) 4f 5d 6s 1s 2s 2p 3s 3p 3d 4s 4p 4d 4f 5s 5p 5d 6s 8 18 32 18 81 Tl thallium : ( Xe ) 4f 5d 6s 6p 1s 2s 2p 3s 3p 3d 4s 4p 4d 4f 5s 5p 5d 6s 6p 8 18 32 18 82 Pb lead : ( Xe ) 4f 5d 6s 6p 1s 2s 2p 3s 3p 3d 4s 4p 4d 4f 5s 5p 5d 6s 6p 8 18 32 18 83 Bi bismuth : ( Xe ) 4f 5d 6s 6p 1s 2s 2p 3s 3p 3d 4s 4p 4d 4f 5s 5p 5d 6s 6p 8 18 32 18 5 84 Po polonium : ( Xe ) 4f 5d 6s 6p 1s 2s 2p 3s 3p 3d 4s 4p 4d 4f 5s 5p 5d 6s 6p 8 18 32 18 6 85 At astatine : ( Xe ) 4f 5d 6s 6p 1s 2s 2p 3s 3p 3d 4s 4p 4d 4f 5s 5p 5d 6s 6p 8 18 32 18 7 86 Rn radon : ( Xe ) 4f 5d 6s 6p 1s 2s 2p 3s 3p 3d 4s 4p 4d 4f 5s 5p 5d 6s 6p 8 18 32 18 8 87 Fr francium : ( Rn ) 7s 1s 2s 2p 3s 3p 3d 4s 4p 4d 4f 5s 5p 5d 6s 6p 7s 8 18 32 18 8 88 Ra radium : ( Rn ) 7s 1s 2s 2p 3s 3p 3d 4s 4p 4d 4f 5s 5p 5d 6s 6p 7s 8 18 32 18 8 89 Ac actinium : ( Rn ) 6d 7s 1s 2s 2p 3s 3p 3d 4s 4p 4d 4f 5s 5p 5d 6s 6p 6d 7s 8 18 32 18 9 90 Th thorium : ( Rn ) 6d 7s 1s 2s 2p 3s 3p 3d 4s 4p 4d 4f 5s 5p 5d 6s 6p 6d 7s 8 18 32 18 10 91 Pa protactinium : ( Rn ) 5f 6d 7s 1s 2s 2p 3s 3p 3d 4s 4p 4d 4f 5s 5p 5d 5f 6s 6p 6d 7s 8 18 32 20 9 92 U uranium : ( Rn ) 5f 6d 7s 1s 2s 2p 3s 3p 3d 4s 4p 4d 4f 5s 5p 5d 5f 6s 6p 6d 7s 8 18 32 21 9 93 Np neptunium : ( Rn ) 5f 6d 7s 1s 2s 2p 3s 3p 3d 4s 4p 4d 4f 5s 5p 5d 5f 6s 6p 6d 7s 8 18 32 22 9 94 Pu plutonium : ( Rn ) 5f 7s 1s 2s 2p 3s 3p 3d 4s 4p 4d 4f 5s 5p 5d 5f 6s 6p 7s 8 18 32 24 8 95 Am americium : ( Rn ) 5f 7s 1s 2s 2p 3s 3p 3d 4s 4p 4d 4f 5s 5p 5d 5f 6s 6p 7s 8 18 32 25 8 96 Cm curium : ( Rn ) 5f 6d 7s 1s 2s 2p 3s 3p 3d 4s 4p 4d 4f 5s 5p 5d 5f 6s 6p 6d 7s 8 18 32 25 9 97 Bk berkelium : ( Rn ) 5f 7s 1s 2s 2p 3s 3p 3d 4s 4p 4d 4f 5s 5p 5d 5f 6s 6p 7s 8 18 32 27 8 98 Cf californium : ( Rn ) 5f 7s 1s 2s 2p 3s 3p 3d 4s 4p 4d 4f 5s 5p 5d 5f 6s 6p 7s 8 18 32 28 8 99 Es einsteinium : ( Rn ) 5f 7s 1s 2s 2p 3s 3p 3d 4s 4p 4d 4f 5s 5p 5d 5f 6s 6p 7s 8 18 32 29 8 100 Fm fermium : ( Rn ) 5f 7s 1s 2s 2p 3s 3p 3d 4s 4p 4d 4f 5s 5p 5d 5f 6s 6p 7s 8 18 32 30 8 101 Md mendelevium : ( Rn ) 5f 7s 1s 2s 2p 3s 3p 3d 4s 4p 4d 4f 5s 5p 5d 5f 6s 6p 7s 8 18 32 31 8 102 No nobelium : ( Rn ) 5f 7s 1s 2s 2p 3s 3p 3d 4s 4p 4d 4f 5s 5p 5d 5f 6s 6p 7s 8 18 32 32 8 103 Lr lawrencium : ( Rn ) 5f 7s 7p 1s 2s 2p 3s 3p 3d 4s 4p 4d 4f 5s 5p 5d 5f 6s 6p 7s 7p 8 18 32 32 8 104 Rf rutherfordium : ( Rn ) 5f 6d 7s 1s 2s 2p 3s 3p 3d 4s 4p 4d 4f 5s 5p 5d 5f 6s 6p 6d 7s 8 18 32 32 10 105 Db dubnium : ( Rn ) 5f 6d 7s 1s 2s 2p 3s 3p 3d 4s 4p 4d 4f 5s 5p 5d 5f 6s 6p 6d 7s 8 18 32 32 11 106 Sg seaborgium : ( Rn ) 5f 6d 7s 1s 2s 2p 3s 3p 3d 4s 4p 4d 4f 5s 5p 5d 5f 6s 6p 6d 7s 8 18 32 32 12 107 Bh bohrium : ( Rn ) 5f 6d 7s 1s 2s 2p 3s 3p 3d 4s 4p 4d 4f 5s 5p 5d 5f 6s 6p 6d 7s 8 18 32 32 13 108 Hs hassium : ( Rn ) 5f 6d 7s 1s 2s 2p 3s 3p 3d 4s 4p 4d 4f 5s 5p 5d 5f 6s 6p 6d 7s 8 18 32 32 14 109 Mt meitnerium : ( Rn ) 5f 6d 7s 1s 2s 2p 3s 3p 3d 4s 4p 4d 4f 5s 5p 5d 5f 6s 6p 6d 7s 8 18 32 32 15 110 Ds darmstadtium : ( Rn ) 5f 6d 7s 1s 2s 2p 3s 3p 3d 4s 4p 4d 4f 5s 5p 5d 5f 6s 6p 6d 7s 8 18 32 32 16 111 Rg roentgenium : ( Rn ) 5f 6d 7s 1s 2s 2p 3s 3p 3d 4s 4p 4d 4f 5s 5p 5d 5f 6s 6p 6d 7s 8 18 32 32 17 112 Cn copernicium : ( Rn ) 5f 6d 7s 1s 2s 2p 3s 3p 3d 4s 4p 4d 4f 5s 5p 5d 5f 6s 6p 6d 7s 8 18 32 32 18 113 Nh nihonium : ( Rn ) 5f 6d 7s 7p 1s 2s 2p 3s 3p 3d 4s 4p 4d 4f 5s 5p 5d 5f 6s 6p 6d 7s 7p 8 18 32 32 18 114 Fl flerovium : ( Rn ) 5f 6d 7s 7p 1s 2s 2p 3s 3p 3d 4s 4p 4d 4f 5s 5p 5d 5f 6s 6p 6d 7s 7p 8 18 32 32 18 115 Mc moscovium : ( Rn ) 5f 6d 7s 7p 1s 2s 2p 3s 3p 3d 4s 4p 4d 4f 5s 5p 5d 5f 6s 6p 6d 7s 7p 8 18 32 32 18 5 116 Lv livermorium : ( Rn ) 5f 6d 7s 7p 1s 2s 2p 3s 3p 3d 4s 4p 4d 4f 5s 5p 5d 5f 6s 6p 6d 7s 7p 8 18 32 32 18 6 117 Ts tennessine : ( Rn ) 5f 6d 7s 7p 1s 2s 2p 3s 3p 3d 4s 4p 4d 4f 5s 5p 5d 5f 6s 6p 6d 7s 7p 8 18 32 32 18 7 118 Og oganesson : ( Rn ) 5f 6d 7s 7p 1s 2s 2p 3s 3p 3d 4s 4p 4d 4f 5s 5p 5d 5f 6s 6p 6d 7s 7p 8 18 32 32 18 8 119 Uue ununennium : ( Og ) 8s 1s 2s 2p 3s 3p 3d 4s 4p 4d 4f 5s 5p 5d 5f 6s 6p 6d 7s 7p 8s 8 18 32 32 18 8 120 Ubn unbinilium : ( Og ) 8s 1s 2s 2p 3s 3p 3d 4s 4p 4d 4f 5s 5p 5d 5f 6s 6p 6d 7s 7p 8s 8 18 32 32 18 8 121 Ubu unbiunium : ( Og ) 8s 8p 1s 2s 2p 3s 3p 3d 4s 4p 4d 4f 5s 5p 5d 5f 6s 6p 6d 7s 7p 8s 8p 8 18 32 32 18 8 122 Ubb unbibium : ( Og ) 7d 8s 8p 1s 2s 2p 3s 3p 3d 4s 4p 4d 4f 5s 5p 5d 5f 6s 6p 6d 7s 7p 7d 8s 8p 8 18 32 32 18 9 123 Ubt unbitrium : ( Og ) 6f 7d 8s 8p 1s 2s 2p 3s 3p 3d 4s 4p 4d 4f 5s 5p 5d 5f 6s 6p 6d 6f 7s 7p 7d 8s 8p 8 18 32 32 19 9 124 Ubq unbiquadium : ( Og ) 6f 8s 8p 1s 2s 2p 3s 3p 3d 4s 4p 4d 4f 5s 5p 5d 5f 6s 6p 6d 6f 7s 7p 8s 8p 8 18 32 32 21 8 125 Ubp unbipentium : ( Og ) 5g 6f 8s 8p 1s 2s 2p 3s 3p 3d 4s 4p 4d 4f 5s 5p 5d 5f 5g 6s 6p 6d 6f 7s 7p 8s 8p 8 18 32 33 21 8 126 Ubh unbihexium : ( Og ) 5g 6f 7d 8s 8p 1s 2s 2p 3s 3p 3d 4s 4p 4d 4f 5s 5p 5d 5f 5g 6s 6p 6d 6f 7s 7p 7d 8s 8p 8 18 32 34 20 9 127 Ubs unbiseptium : ( Og ) 5g 6f 8s 8p 1s 2s 2p 3s 3p 3d 4s 4p 4d 4f 5s 5p 5d 5f 5g 6s 6p 6d 6f 7s 7p 8s 8p 8 18 32 35 20 8 128 Ubo unbioctium : ( Og ) 5g 6f 8s 8p 1s 2s 2p 3s 3p 3d 4s 4p 4d 4f 5s 5p 5d 5f 5g 6s 6p 6d 6f 7s 7p 8s 8p 8 18 32 36 20 8 129 Ube unbiennium : ( Og ) 5g 6f 8s 8p 1s 2s 2p 3s 3p 3d 4s 4p 4d 4f 5s 5p 5d 5f 5g 6s 6p 6d 6f 7s 7p 8s 8p 8 18 32 37 20 8 130 Utn untrinilium : ( Og ) 5g 6f 8s 8p 1s 2s 2p 3s 3p 3d 4s 4p 4d 4f 5s 5p 5d 5f 5g 6s 6p 6d 6f 7s 7p 8s 8p 8 18 32 38 20 8 131 Utu untriunium : ( Og ) 5g 6f 8s 8p 1s 2s 2p 3s 3p 3d 4s 4p 4d 4f 5s 5p 5d 5f 5g 6s 6p 6d 6f 7s 7p 8s 8p 8 18 32 39 20 8 132 Utb untribium : ( Og ) 5g 6f 8s 8p 1s 2s 2p 3s 3p 3d 4s 4p 4d 4f 5s 5p 5d 5f 5g 6s 6p 6d 6f 7s 7p 8s 8p 8 18 32 40 20 8 133 Utt untritrium : ( Og ) 5g 6f 8s 8p 1s 2s 2p 3s 3p 3d 4s 4p 4d 4f 5s 5p 5d 5f 5g 6s 6p 6d 6f 7s 7p 8s 8p 8 18 32 40 21 8 134 Utq untriquadium : ( Og ) 5g 6f 8s 8p 1s 2s 2p 3s 3p 3d 4s 4p 4d 4f 5s 5p 5d 5f 5g 6s 6p 6d 6f 7s 7p 8s 8p 8 18 32 40 22 8 135 Utp untripentium : ( Og ) 5g 6f 8s 8p 1s 2s 2p 3s 3p 3d 4s 4p 4d 4f 5s 5p 5d 5f 5g 6s 6p 6d 6f 7s 7p 8s 8p 8 18 32 41 22 8 136 Uth untrihexium : ( Og ) 5g 6f 8s 8p 1s 2s 2p 3s 3p 3d 4s 4p 4d 4f 5s 5p 5d 5f 5g 6s 6p 6d 6f 7s 7p 8s 8p 8 18 32 42 22 8 137 Uts untriseptium : ( Og ) 5g 6f 7d 8s 8p 1s 2s 2p 3s 3p 3d 4s 4p 4d 4f 5s 5p 5d 5f 5g 6s 6p 6d 6f 7s 7p 7d 8s 8p 8 18 32 43 21 9 138 Uto untrioctium : ( Og ) 5g 6f 7d 8s 8p 1s 2s 2p 3s 3p 3d 4s 4p 4d 4f 5s 5p 5d 5f 5g 6s 6p 6d 6f 7s 7p 7d 8s 8p 8 18 32 44 21 9 139 Ute untriennium : ( Og ) 5g 6f 7d 8s 8p 1s 2s 2p 3s 3p 3d 4s 4p 4d 4f 5s 5p 5d 5f 5g 6s 6p 6d 6f 7s 7p 7d 8s 8p 8 18 32 45 20 10 140 Uqn unquadnilium : ( Og ) 5g 6f 7d 8s 8p 1s 2s 2p 3s 3p 3d 4s 4p 4d 4f 5s 5p 5d 5f 5g 6s 6p 6d 6f 7s 7p 7d 8s 8p 8 18 32 46 21 9 141 Uqu unquadunium : ( Og ) 5g 6f 7d 8s 8p 1s 2s 2p 3s 3p 3d 4s 4p 4d 4f 5s 5p 5d 5f 5g 6s 6p 6d 6f 7s 7p 7d 8s 8p 8 18 32 47 20 10 142 Uqb unquadbium : ( Og ) 5g 6f 7d 8s 8p 1s 2s 2p 3s 3p 3d 4s 4p 4d 4f 5s 5p 5d 5f 5g 6s 6p 6d 6f 7s 7p 7d 8s 8p 8 18 32 48 20 10 143 Uqt unquadtrium : ( Og ) 5g 6f 7d 8s 8p 1s 2s 2p 3s 3p 3d 4s 4p 4d 4f 5s 5p 5d 5f 5g 6s 6p 6d 6f 7s 7p 7d 8s 8p 8 18 32 49 20 10 144 Uqq unquadquadium : ( Og ) 5g 6f 7d 8s 8p 1s 2s 2p 3s 3p 3d 4s 4p 4d 4f 5s 5p 5d 5f 5g 6s 6p 6d 6f 7s 7p 7d 8s 8p 8 18 32 50 19 11 145 Uqp unquadpentium : ( Og ) 5g 6f 7d 8s 8p 1s 2s 2p 3s 3p 3d 4s 4p 4d 4f 5s 5p 5d 5f 5g 6s 6p 6d 6f 7s 7p 7d 8s 8p 8 18 32 50 21 10 146 Uqh unquadhexium : ( Og ) 5g 6f 7d 8s 8p 1s 2s 2p 3s 3p 3d 4s 4p 4d 4f 5s 5p 5d 5f 5g 6s 6p 6d 6f 7s 7p 7d 8s 8p 8 18 32 50 22 10 147 Uqs unquadseptium : ( Og ) 5g 6f 7d 8s 8p 1s 2s 2p 3s 3p 3d 4s 4p 4d 4f 5s 5p 5d 5f 5g 6s 6p 6d 6f 7s 7p 7d 8s 8p 8 18 32 50 23 10 148 Uqo unquadoctium : ( Og ) 5g 6f 7d 8s 8p 1s 2s 2p 3s 3p 3d 4s 4p 4d 4f 5s 5p 5d 5f 5g 6s 6p 6d 6f 7s 7p 7d 8s 8p 8 18 32 50 24 10 149 Uqe unquadennium : ( Og ) 5g 6f 7d 8s 8p 1s 2s 2p 3s 3p 3d 4s 4p 4d 4f 5s 5p 5d 5f 5g 6s 6p 6d 6f 7s 7p 7d 8s 8p 8 18 32 50 24 11 150 Upn unpentnilium : ( Og ) 5g 6f 7d 8s 8p 1s 2s 2p 3s 3p 3d 4s 4p 4d 4f 5s 5p 5d 5f 5g 6s 6p 6d 6f 7s 7p 7d 8s 8p 8 18 32 50 24 12 151 Upu unpentunium : ( Og ) 5g 6f 7d 8s 8p 1s 2s 2p 3s 3p 3d 4s 4p 4d 4f 5s 5p 5d 5f 5g 6s 6p 6d 6f 7s 7p 7d 8s 8p 8 18 32 50 26 11 152 Upb unpentbium : ( Og ) 5g 6f 7d 8s 8p 1s 2s 2p 3s 3p 3d 4s 4p 4d 4f 5s 5p 5d 5f 5g 6s 6p 6d 6f 7s 7p 7d 8s 8p 8 18 32 50 27 11 153 Upt unpenttrium : ( Og ) 5g 6f 7d 8s 8p 1s 2s 2p 3s 3p 3d 4s 4p 4d 4f 5s 5p 5d 5f 5g 6s 6p 6d 6f 7s 7p 7d 8s 8p 8 18 32 50 29 10 154 Upq unpentquadium : ( Og ) 5g 6f 7d 8s 8p 1s 2s 2p 3s 3p 3d 4s 4p 4d 4f 5s 5p 5d 5f 5g 6s 6p 6d 6f 7s 7p 7d 8s 8p 8 18 32 50 30 10 155 Upp unpentpentium : ( Og ) 5g 6f 7d 8s 8p 1s 2s 2p 3s 3p 3d 4s 4p 4d 4f 5s 5p 5d 5f 5g 6s 6p 6d 6f 7s 7p 7d 8s 8p 8 18 32 50 31 10 156 Uph unpenthexium : ( Og ) 5g 6f 7d 8s 8p 1s 2s 2p 3s 3p 3d 4s 4p 4d 4f 5s 5p 5d 5f 5g 6s 6p 6d 6f 7s 7p 7d 8s 8p 8 18 32 50 32 10 157 Ups unpentseptium : ( Og ) 5g 6f 7d 8s 8p 1s 2s 2p 3s 3p 3d 4s 4p 4d 4f 5s 5p 5d 5f 5g 6s 6p 6d 6f 7s 7p 7d 8s 8p 8 18 32 50 32 11 158 Upo unpentoctium : ( Og ) 5g 6f 7d 8s 8p 1s 2s 2p 3s 3p 3d 4s 4p 4d 4f 5s 5p 5d 5f 5g 6s 6p 6d 6f 7s 7p 7d 8s 8p 8 18 32 50 32 12 159 Upe unpentennium : ( Og ) 5g 6f 7d 8s 8p 9s 1s 2s 2p 3s 3p 3d 4s 4p 4d 4f 5s 5p 5d 5f 5g 6s 6p 6d 6f 7s 7p 7d 8s 8p 9s 8 18 32 50 32 12 160 Uhn unhexnilium : ( Og ) 5g 6f 7d 8s 8p 9s 1s 2s 2p 3s 3p 3d 4s 4p 4d 4f 5s 5p 5d 5f 5g 6s 6p 6d 6f 7s 7p 7d 8s 8p 9s 8 18 32 50 32 13 161 Uhu unhexunium : ( Og ) 5g 6f 7d 8s 8p 9s 1s 2s 2p 3s 3p 3d 4s 4p 4d 4f 5s 5p 5d 5f 5g 6s 6p 6d 6f 7s 7p 7d 8s 8p 9s 8 18 32 50 32 14 162 Uhb unhexbium : ( Og ) 5g 6f 7d 8s 8p 1s 2s 2p 3s 3p 3d 4s 4p 4d 4f 5s 5p 5d 5f 5g 6s 6p 6d 6f 7s 7p 7d 8s 8p 8 18 32 50 32 16 163 Uht unhextrium : ( Og ) 5g 6f 7d 8s 8p 1s 2s 2p 3s 3p 3d 4s 4p 4d 4f 5s 5p 5d 5f 5g 6s 6p 6d 6f 7s 7p 7d 8s 8p 8 18 32 50 32 17 164 Uhq unhexquadium : ( Og ) 5g 6f 7d 8s 8p 1s 2s 2p 3s 3p 3d 4s 4p 4d 4f 5s 5p 5d 5f 5g 6s 6p 6d 6f 7s 7p 7d 8s 8p 8 18 32 50 32 18 165 Uhp unhexpentium : ( Og ) 5g 6f 7d 8s 8p 9s 1s 2s 2p 3s 3p 3d 4s 4p 4d 4f 5s 5p 5d 5f 5g 6s 6p 6d 6f 7s 7p 7d 8s 8p 9s 8 18 32 50 32 18 166 Uhh unhexhexium : ( Og ) 5g 6f 7d 8s 8p 9s 1s 2s 2p 3s 3p 3d 4s 4p 4d 4f 5s 5p 5d 5f 5g 6s 6p 6d 6f 7s 7p 7d 8s 8p 9s 8 18 32 50 32 18 167 Uhs unhexseptium : ( Og ) 5g 6f 7d 8s 8p 9s 9p 1s 2s 2p 3s 3p 3d 4s 4p 4d 4f 5s 5p 5d 5f 5g 6s 6p 6d 6f 7s 7p 7d 8s 8p 9s 9p 8 18 32 50 32 18 168 Uho unhexoctium : ( Og ) 5g 6f 7d 8s 8p 9s 9p 1s 2s 2p 3s 3p 3d 4s 4p 4d 4f 5s 5p 5d 5f 5g 6s 6p 6d 6f 7s 7p 7d 8s 8p 9s 9p 8 18 32 50 32 18 169 Uhe unhexennium : ( Og ) 5g 6f 7d 8s 8p 9s 9p 1s 2s 2p 3s 3p 3d 4s 4p 4d 4f 5s 5p 5d 5f 5g 6s 6p 6d 6f 7s 7p 7d 8s 8p 9s 9p 8 18 32 50 32 18 5 170 Usn unseptnilium : ( Og ) 5g 6f 7d 8s 8p 9s 9p 1s 2s 2p 3s 3p 3d 4s 4p 4d 4f 5s 5p 5d 5f 5g 6s 6p 6d 6f 7s 7p 7d 8s 8p 9s 9p 8 18 32 50 32 18 6 171 Usu unseptunium : ( Og ) 5g 6f 7d 8s 8p 9s 9p 1s 2s 2p 3s 3p 3d 4s 4p 4d 4f 5s 5p 5d 5f 5g 6s 6p 6d 6f 7s 7p 7d 8s 8p 9s 9p 8 18 32 50 32 18 7 172 Usb unseptbium : ( Og ) 5g 6f 7d 8s 8p 9s 9p 1s 2s 2p 3s 3p 3d 4s 4p 4d 4f 5s 5p 5d 5f 5g 6s 6p 6d 6f 7s 7p 7d 8s 8p 9s 9p 8 18 32 50 32 18 8 Legend 1s 2s 2p 3s 3p 3d 4s 4p 4d 4f 5s 5p 5d 5f 5g 6s 6p 6d 6f 6g 7s 7p 7d 8s 8p 9s 9p 173 Ust unsepttrium : ( Og ) 5g 6f 6g 7d 8s 8p 9s 9p 1s 2s 2p 3s 3p 3d 4s 4p 4d 4f 5s 5p 5d 5f 5g 6s 6p 6d 6f 6g 7s 7p 7d 8s 8p 9s 9p 8 18 32 50 33 18 8 References All sources concur with the data above except in the separately listed instances : NIST http://physics.nist.gov/PhysRefData/IonEnergy/ionEnergy.html ; 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 ) 5f ( H ) 6d 7s 92 U : ( Rn ) 5f ( I ) 6d 7s 93 Np : ( Rn ) 5f ( I ) 6d 7s 103 Lr : ( Rn ) 5f 7s 7p question - marked 104 Rf : ( Rn ) 5f 6d 7s 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. Webelements http://www.webelements.com/ ; retrieved July 2005, electron configurations based on : Atomic, Molecular, & Optical Physics Handbook, Ed. Gordon W.F. Drake, American Institute of Physics, Woodbury, New York, USA, 1996. J.E. Huheey, E.A. Keiter, and R.L. Keiter in Inorganic Chemistry : Principles of Structure and Reactivity, 4th edition, HarperCollins, New York, USA, 1993. R.L. DeKock and H.B. Gray in Chemical Structure and bonding, Benjamin / Cummings, Menlo Park, California, USA, 1980. A.M. James and M.P. Lord in Macmillan 's Chemical and Physical Data, Macmillan, London, UK, 1992. 103 Lr : ( Rn ). 5f. 7s. 7p tentative ; 2.8. 18.32. 32.9. 2 ( inconsistent ) 104 Rf : ( Rn ). 5f. 6d. 7s tentative 105 Db : ( Rn ). 5f. 6d. 7s ( a guess based upon that of tantalum ) ; 2.8. 18.32. 32.11. 2 106 Sg : ( Rn ). 5f. 6d. 7s ( a guess based upon that of tungsten ) ; 2.8. 18.32. 32.12. 2 107 Bh : ( Rn ). 5f. 6d. 7s ( a guess based upon that of rhenium ) ; 2.8. 18.32. 32.13. 2 108 Hs : ( Rn ). 5f. 6d. 7s ( a guess based upon that of osmium ) ; 2.8. 18.32. 32.14. 2 109 Mt : ( Rn ). 5f. 6d. 7s ( a guess based upon that of iridium ) ; 2.8. 18.32. 32.15. 2 110 Ds : ( Rn ). 5f. 6d. 7s ( a guess based upon that of platinum ) ; 2.8. 18.32. 32.17. 1 111 Rg : ( Rn ). 5f. 6d. 7s ( a guess based upon that of gold ) ; 2.8. 18.32. 32.18. 1 112 Cn : ( Rn ). 5f. 6d. 7s ( a guess based upon that of mercury ) ; 2.8. 18.32. 32.18. 2 113 Nh : ( Rn ). 5f. 6d. 7s. 7p ( a guess based upon that of thallium ) ; 2.8. 18.32. 32.18. 3 114 Fl : ( Rn ). 5f. 6d. 7s. 7p ( a guess based upon that of lead ) ; 2.8. 18.32. 32.18. 4 115 Mc : ( Rn ). 5f. 6d. 7s. 7p ( a guess based upon that of bismuth ) ; 2.8. 18.32. 32.18. 5 116 Lv : ( Rn ). 5f. 6d. 7s. 7p ( a guess based upon that of polonium ) ; 2.8. 18.32. 32.18. 6 117 Ts : ( Rn ). 5f. 6d. 7s. 7p ( a guess based upon that of astatine ) ; 2.8. 18.32. 32.18. 7 118 Og : ( Rn ). 5f. 6d. 7s. 7p ( a guess based upon that of radon ) ; 2.8. 18.32. 32.18. 8 Lange J.A. Dean ( ed ), Lange 's Handbook of Chemistry ( 15th Edition ), online version, McGraw - Hill, 1999 ; Section 4, Table 4.1 Electronic Configuration and Properties of the Elements. ( Elements 1 -- 103 ) 97 Bk : ( Rn ) 5f 6d 7s 103 Lr : ( Rn ) 4f ( sic ) 6d 7s Hill and Petrucci Hill and Petrucci, General Chemistry : An Integrated Approach ( 3rd edition ), Prentice Hall. ( Elements 1 -- 106 ) 58 Ce : ( Xe ) 4f 6s 103 Lr : ( Rn ) 5f 6d 7s 104 Rf : ( Rn ) 5f 6d 7s ( agrees with guess above ) 105 Db : ( Rn ) 5f 6d 7s 106 Sg : ( Rn ) 5f 6d 7s Hoffman, Lee, and Pershina Hoffman, Darleane C. ; Lee, Diana M. ; Pershina, Valeria ( 2006 ). `` Transactinides and the future elements ''. In Morss ; Edelstein, Norman M. ; Fuger, Jean. The Chemistry of the Actinide and Transactinide Elements ( 3rd ed. ). Dordrecht, The Netherlands : Springer Science + Business Media. p. 1722. ISBN 1 - 4020 - 3555 - 1. This book contains predicted electron configurations for the elements 119 -- 172 and 184, based on relativistic Dirac -- Fock calculations by B. Fricke in Fricke, B. ( 1975 ). Dunitz, J.D., ed. `` Superheavy elements a prediction of their chemical and physical properties ''. Structure and Bonding. Berlin : Springer - Verlag. 21 : 89 -- 144. doi : 10.1007 / BFb0116496. Fricke Predicted electron configurations for element 173 based on relativistic Dirac -- Fock calculations by B. Fricke Fricke, Burkhard ( 1977 ). `` Dirac - Fock - Slater calculations for the elements Z = 100, fermium, to Z = 173 '' ( PDF ). Recent Impact of Physics on Inorganic Chemistry. 19 : 83 -- 192. Bibcode : 1977ADNDT... 19... 83F. doi : 10.1016 / 0092 - 640X ( 77 ) 90010 - 9. Retrieved 25 February 2016. Chemical elements data Elements List of chemical elements -- atomic mass, atomic number, symbol, name Periodic table Data Abundance of the chemical elements in Earth 's crust, sea water, Sun and solar system data page Atomic radius empirical, calculated, van der Waals radius, covalent radius data page Boiling point data page Critical point data page Density solid, liquid, gas data page Elastic properties of the elements : Young 's modulus, Poisson 's ratio, bulk modulus, shear modulus data page Electrical resistivity data page Electron affinity data page Electron configuration data page Electronegativity ( Pauling scale ) data page Hardness : Mohs hardness, Vickers hardness, Brinell hardness data page Heat capacity data page Heat of fusion data page Heat of vaporization data page Ionization energy ( in eV ) and molar ionization energies ( in kJ / mol ) data page Melting point data page Molar ionization energy Oxidation state data page Speed of sound data page Standard atomic weight Thermal conductivity data page Thermal expansion data page Vapor pressure data page Periodic table Periodic table forms Standard 18 - column 18 - column, large cells 32 - column, large cells Alternative Alternatives Chemical Galaxy Janet 's left step table Extended Extension beyond the 7th period Fricke model large cells Pyykkö model Sets of elements By periodic table structure Groups 1 ( Alkali metals ) 2 ( Alkaline earth metals ) 5 6 7 8 9 10 11 12 13 14 15 ( Pnictogens ) 16 ( Chalcogens ) 17 ( Halogens ) 18 ( Noble gases ) Periods 5 6 7 8 + Aufbau Fricke Pyykkö Blocks s - block p - block d - block f - block g - block Aufbau principle By metallicity Metals Alkali metals Alkaline earth metals Lanthanides Actinides Superactinides Eka - superactinides Transition metals Post-transition metals Metalloids Lists of metalloids by source Dividing line Nonmetals Polyatomic nonmetals Diatomic nonmetals Noble gases Other sets Nutritional elements Platinum - group metals ( PGM ) Rare - earth elements Refractory metals Precious metals Coinage metals Noble metal Heavy metals Native metals Transuranium elements Transactinide elements Major actinides Minor actinides Elements Lists By : Abundance ( in humans ) Atomic properties Nuclear stability Production Symbol Properties Atomic weight Crystal structure Electron affinity Electron configuration Electronegativity Allen Pauling Goldschmidt classification Maximum valence Data pages Abundance Atomic radius Boiling point Critical point Density Elasticity Electrical resistivity Electron affinity Electron configuration Electronegativity Hardness Heat capacity Heat of fusion Heat of vaporization Ionization energy Melting point Oxidation state Speed of sound Thermal conductivity Thermal expansion coefficient Vapor pressure History Element discoveries Mendeleev 's predictions Naming Etymology controversies places scientists in East Asia See also IUPAC nomenclature systematic element name Trivial name Dmitri Mendeleev Book Chemistry Portal Retrieved from `` https://en.wikipedia.org/w/index.php?title=Electron_configurations_of_the_elements_(data_page)&oldid=805357954 '' Categories : Atoms Chemical element data pages Talk About Wikipedia বাংলা Esperanto فارسی Français Bahasa Indonesia Polski Português Русский Svenska ไทย 中文 Edit links This page was last edited on 14 October 2017, at 21 : 05. About Wikipedia

Question: ground-state electron configuration of a neutral atom of iron
Answer: 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