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A7: Electron Affinities

  • Page ID
    11304
  • The electron affinity is defined as the amount of energy released when an electron is added to a neutral atom or molecule in the gaseous state to form a negative ion

    \[X_{(g)} + e^− \rightarrow X^−_{(g)} + energy\]

    Z Element Name Electron affinity (eV) Electron affinity (kJ/mol)
    1 2D Deuterium 0.754 59(8) 72.807(8)
    1 1H Hydrogen 0.754 195(19) 72.769(2)
    2 He Helium -19.7
    3 Li Lithium 0.618 049(2) 59.6327(2)
    4 Be Beryllium -2.4
    5 B Boron 0.279 723(24) 26.989(3)
    6 C Carbon 1.262 118(20) 121.776(2)
    7 N Nitrogen -1.4
    8 16O Oxygen 1.461 1134(9) 140.9760(1)
    8 17O Oxygen 1.461 108(4) 140.9755(4)
    8 18O Oxygen 1.461 105(3) 140.9752(3)
    9 F Fluorine 3.401 1895(25) 328.1649(3)
    10 Ne Neon -
    11 Na Sodium 0.547 926(25) 52.867(3)
    12 Mg Magnesium -
    13 Al Aluminium 0.432 83(5) 41.762(5)
    14 Si Silicon 1.3895210(7) 134.0684(1)
    15 P Phosphorus 0.746 609(9) 72.037(1)
    16 32S Sulfur 2.077 1040(6) 200.4101(1)
    16 34S Sulfur 2.077 1044(12) 200.4101(2)
    17 Cl Chlorine 3.612 724(27) 348.575(3)
    18 Ar Argon -11.5
    19 K Potassium 0.501 459(12) 48.383(2)
    20 Ca Calcium 0.024 55(10) 2.37(1)
    21 Sc Scandium 0.188(20) 18(2)
    22 Ti Titanium 0.084(9) 8(1)
    23 V Vanadium 0.526(12) 50.8(12)
    24 Cr Chromium 0.675 84(12) 65.21(2)
    25 Mn Manganese -1 (theoretical)
    26 Fe Iron 0.151(3) 14.6(3)
    27 Co Cobalt 0.6633(6) 64.00(6)
    28 Ni Nickel 1.157 16(12) 111.65(2)
    29 Cu Copper 1.235 78(4) 119.235(4)
    30 Zn Zinc -
    31 Ga Gallium 0.43(3) 41(3)
    32 Ge Germanium 1.232 6764(12) 118.9352(2)
    33 As Arsenic 0.8048(2) 77.65(2)
    34 Se Selenium 2.020 6046(11) 194.9587(2)
    35 Br Bromine 3.363 590(3) 324.5371(3)
    36 Kr Krypton -
    37 Rb Rubidium 0.485 916(20) 46.884(2)
    38 Sr Strontium 0.052 06(6) 5.023(6)
    39 Y Yttrium 0.307(12) 29.6(12)
    40 Zr Zirconium 0.427(14) 41.2(14)
    41 Nb Niobium 0.894(25) 86.3(25)
    42 Mo Molybdenum 0.7473(3) 72.10(3)
    43 Tc Technetium ?
    44 Ru Ruthenium 1.046 38(25) 100.96(3)
    45 Rh Rhodium 1.142 89(20) 110.27(2)
    46 Pd Palladium 0.562 14(12) 54.24(2)
    47 Ag Silver 1.304 47(3) 125.862(3)
    48 Cd Cadmium -
    49 In Indium 0.383 92(6) 37.043(6)
    50 Sn Tin 1.112 070(2) 107.2984(2)
    51 Sb Antimony 1.047 401(18) 101.059(2)
    52 Te Tellurium 1.970 876(7) 190.161(1)
    53 I Iodine 3.059 0463(38) 295.1531(4)
    54 Xe Xenon -0.056(10) (theoretical)
    55 Cs Caesium 0.471 630(25) 45.505(3)
    56 Ba Barium 0.144 62(6) 13.954(6)
    57 La Lanthanum 0.47(2) 45(2)
    58 Ce Cerium 0.57(2) 55(2)
    59 Pr Praseodymium 0.962(24) 93(3)
    60 Nd Neodymium 0.162 (theoretical)
    61 Pm Promethium 0.129 (theoretical)
    62 Sm Samarium 0.162 (theoretical)
    63 Eu Europium 0.116(13) 11(1)
    64 Gd Gadolinium 0.137 (theoretical)
    65 Tb Terbium 0.436 (theoretical)
    66 Dy Dysprosium 0.352 (theoretical)
    67 Ho Holmium 0.338 (theoretical)
    68 Er Erbium 0.312 (theoretical)
    69 Tm Thulium 1.029(22) 99(3)
    70 Yb Ytterbium 0.00(3)
    71 Lu Lutetium 0.346(14) 33.4(15)
    72 Hf Hafnium 0.114 (theoretical)
    73 Ta Tantalum 0.323(12) 31(2)
    74 W Tungsten 0.816 26(8) 78.76(1)
    75 Re Rhenium 0.15(10) 14(10)
    76 Os Osmium 1.077 80(12) 103.99(2)
    77 Ir Iridium 1.564 36(15) 150.94(2)
    78 Pt Platinum 2.125 10(5) 205.041(5)
    79 Au Gold 2.308 610(25) 222.747(3)
    80 Hg Mercury -
    81 Tl Thallium 0.377(13) 36.4(14)
    82 Pb Lead 0.364(8) 35(1)
    83 Bi Bismuth 0.942 362(13) 90.924(2)
    84 Po Polonium 1.32(30) (theoretical)
    85 At Astatine 2.8(2) (theoretical)
    86 Rn Radon
    87 Fr Francium 0.491(5) (theoretical)
    88 Ra Radium
    89 Ac Actinium
    90 Th Thorium
    91 Pa Protactinium
    92 U Uranium
    93 Np Neptunium
    94 Pu Plutonium
    95 Am Americium
    96 Cm Curium
    97 Bk Berkelium
    98 Cf Californium
    99 Es Einsteinium
    100 Fm Fermium
    101 Md Mendelevium
    102 No Nobelium
    103 Lr Lawrencium
    104 Rf Rutherfordium
    105 Db Dubnium
    106 Sg Seaborgium
    107 Bh Bohrium
    108 Hs Hassium
    109 Mt Meitnerium
    110 Ds Darmstadtium
    111 Rg Roentgenium
    112 Cn Copernicium
    113 Uut Ununtrium
    114 Fl Flerovium
    115 Uup Ununpentium
    116 Lv Livermorium
    117 Uus Ununseptium 2.6 or 1.8 (theoretical)
    118 Uuo Ununoctium 0.056(10) (theoretical)
    119 Uue Ununennium 0.662 (theoretical)
    120 Ubn Unbinilium

    Source: R.E. Dickerson, H.B. Gray and G.P. Haight, "Chemical Principles," 3rd edition, Benjamin/Cummings Publishing, 1979.