Electron affinity (data page)
This page deals with the electron affinity as a property of isolated atoms or molecules (i.e. in the gas phase). Solid state electron affinities are not listed here.
Elements
Electron affinity can be defined in two equivalent ways. First, as the energy that is released by adding an electron to an isolated gaseous atom. The second (reverse) definition is that electron affinity is the energy required to remove an electron from a singly charged gaseous negative ion. Either convention can be used.[1] Whereas ionization energies are always concerned with the formation of positive ions, electron affinities are the negative ion equivalent.
Negative electron affinities can be used in those cases where electron capture requires energy, i.e. when capture can occur only if the impinging electron has a kinetic energy large enough to excite a resonance of the atom-plus-electron system. Conversely electron removal from the anion formed in this way releases energy, which is carried out by the freed electron as kinetic energy. Negative ions formed in these cases are always unstable. They may have lifetimes of the order of microseconds to milliseconds, and invariably autodetach after some time.
Z | Element | Name | Electron affinity (eV) | Electron affinity (kJ/mol) | References |
---|---|---|---|---|---|
1 | 1H | Hydrogen | 0.754 195(19) | 72.769(2) | [2] |
1 | 2H | Deuterium | 0.754 59(8) | 72.807(8) | [2] |
2 | He | Helium | -0.5(2) | -48(20) | estimated (est.)[3] |
3 | Li | Lithium | 0.618 049(22) | 59.632 6(21) | [4] |
4 | Be | Beryllium | -0.5(2) | -48(20) | est.[3] |
5 | B | Boron | 0.279 723(25) | 26.989(3) | [5] |
6 | 12C | Carbon | 1.262 122 6(11) | 121.776 3(1) | [6] |
6 | 13C | Carbon | 1.262 113 6(12) | 121.775 5(2) | [6] |
7 | N | Nitrogen | -0.07 | -6.8 | [3] |
8 | 16O | Oxygen | 1.461 113 6(9) | 140.976 0(2) | [7] |
8 | 17O | Oxygen | 1.461 108 (4) | 140.975 5(3) | [8] |
8 | 18O | Oxygen | 1.461 105(3) | 140.975 2(3) | [8] |
9 | F | Fluorine | 3.401 189 8(24) | 328.164 9(3) | [9][10] |
10 | Ne | Neon | -1.2(2) | -116(19) | est.[3] |
11 | Na | Sodium | 0.547 926(25) | 52.867(3) | [11] |
12 | Mg | Magnesium | -0.4(2) | -40(19) | est.[3] |
13 | Al | Aluminium | 0.432 83(5) | 41.762(5) | [12] |
14 | Si | Silicon | 1.389 521 2(8) | 134.068 4(1) | [7] |
15 | P | Phosphorus | 0.746 609(11) | 72.037(1) | [13] |
16 | 32S | Sulfur | 2.077 104 2(6) | 200.410 1(1) | [7] |
16 | 34S | Sulfur | 2.077 104 5(12) | 200.410 1(2) | [14] |
17 | Cl | Chlorine | 3.612 725(28) | 348.575(3) | [15] |
18 | Ar | Argon | -1.0(2) | -96(20) | est.[3] |
19 | K | Potassium | 0.501 459(13) | 48.383(2) | [16] |
20 | Ca | Calcium | 0.024 55(10) | 2.37(1) | [17] |
21 | Sc | Scandium | 0.188(20) | 18(2) | [18] |
22 | Ti | Titanium | 0.075 54(5) | 7.289(5) | [19] |
23 | V | Vanadium | 0.527 66(20) | 50.911(20) | [20] |
24 | Cr | Chromium | 0.675 84(12) | 65.21(2) | [21] |
25 | Mn | Manganese | -0.5(2) | -50(19) | est.[3] |
26 | Fe | Iron | 0.153 236(35) | 14.785(4) | [22] |
27 | Co | Cobalt | 0.662 26(5) | 63.898(5) | [23] |
28 | Ni | Nickel | 1.157 16(12) | 111.65(2) | [24] |
29 | Cu | Copper | 1.235 78(4) | 119.235(4) | [21] |
30 | Zn | Zinc | -0.6(2) | -58(20) | est.[3] |
31 | Ga | Gallium | 0.301 20(11) | 29.061(12) | [25] |
32 | Ge | Germanium | 1.232 676 4(13) | 118.935 2(2) | [26] |
33 | As | Arsenic | 0.804 8(2) | 77.65(2) | [27] |
34 | Se | Selenium | 2.020 604 7(12) | 194.958 7(2) | [28] |
35 | Br | Bromine | 3.363 588(3) | 324.536 9(3) | [9] |
36 | Kr | Krypton | -1.0(2) | -96(20) | est.[3] |
37 | Rb | Rubidium | 0.485 916(21) | 46.884(3) | [29] |
38 | Sr | Strontium | 0.052 06(6) | 5.023(6) | [30] |
39 | Y | Yttrium | 0.307(12) | 29.6(12) | [18] |
40 | Zr | Zirconium | 0.433 28(9) | 41.806(9) | [31] |
41 | Nb | Niobium | 0.917 40(7) | 88.516(7) | [32] |
42 | Mo | Molybdenum | 0.747 3(3) | 72.10(3) | [21] |
43 | Tc | Technetium | 0.55(20) | 53(20) | est.[33] |
44 | Ru | Ruthenium | 1.046 38(25) | 100.96(3) | [34] |
45 | Rh | Rhodium | 1.142 89(20) | 110.27(2) | [24] |
46 | Pd | Palladium | 0.562 14(12) | 54.24(2) | [24] |
47 | Ag | Silver | 1.304 47(3) | 125.862(3) | [21] |
48 | Cd | Cadmium | -0.7(2) | -68(20) | est.[3] |
49 | In | Indium | 0.383 92(6) | 37.043(6) | [35] |
50 | Sn | Tin | 1.112 070(2) | 107.298 4(3) | [36] |
51 | Sb | Antimony | 1.047 401(19) | 101.059(2) | [37] |
52 | Te | Tellurium | 1.970 875(7) | 190.161(1) | [38] |
53 | 127I | Iodine | 3.059 046 5(37) | 295.153 1(4) | [39] |
53 | 128I | Iodine | 3.059 052(38) | 295.154(4) | [40] |
54 | Xe | Xenon | -0.8(2) | -77(20) | est.[3] |
55 | Cs | Caesium | 0.471 630(25) | 45.505(3) | [11][41] |
56 | Ba | Barium | 0.144 62(6) | 13.954(6) | [42] |
57 | La | Lanthanum | 0.557 546(20) | 53.795(2) | [43] |
58 | Ce | Cerium | 0.57(2) | 55(2) | [44] |
59 | Pr | Praseodymium | 0.109 23(46) | 10.539(45) | [45] |
60 | Nd | Neodymium | 0.097 49(33) | 9.406(32) | [45] |
61 | Pm | Promethium | 0.129 | 12.45 | [46] |
62 | Sm | Samarium | 0.162 | 15.63 | [46] |
63 | Eu | Europium | 0.116(13) | 11.2(13) | [47] |
64 | Gd | Gadolinium | 0.137 | 13.22 | [46] |
65 | Tb | Terbium | 0.131 31(80) | 12.670(77) | [45] |
66 | Dy | Dysprosium | 0.352 | 33.96 | min. value[33] |
67 | Ho | Holmium | 0.338 | 32.61 | [46] |
68 | Er | Erbium | 0.312 | 30.10 | [46] |
69 | Tm | Thulium | 1.029(22) | 99(3) | [48] |
70 | Yb | Ytterbium | -0.02 | -1.93 | est.[33] |
71 | Lu | Lutetium | 0.238 8(7) | 23.04(7) | [49] |
72 | Hf | Hafnium | 0.178 0(7) | 17.18(7) | [50] |
73 | Ta | Tantalum | 0.323(12) | 31(2) | [51] |
74 | W | Tungsten | 0.816 26(8) | 78.76(1) | [52] |
75 | Re | Rhenium | 0.060 396(63) | 5.827 3(61) | [53] |
76 | Os | Osmium | 1.077 80(13) | 103.99(2) | [54] |
77 | Ir | Iridium | 1.564 057(12) | 150.908 6(12) | [55] |
78 | Pt | Platinum | 2.125 10(5) | 205.041(5) | [56] |
79 | Au | Gold | 2.308 610(25) | 222.747(3) | [57] |
80 | Hg | Mercury | -0.5(2) | -48(20) | est.[3] |
81 | Tl | Thallium | 0.320 053(19) | 30.880 4(19) | [58] |
82 | Pb | Lead | 0.356 721(2) | 34.418 3(3) | [59] |
83 | Bi | Bismuth | 0.942 362(13) | 90.924(2) | [60] |
84 | Po | Polonium | 1.40(7) | 136(7) | calculated (calc.)[61] |
85 | At | Astatine | 2.415 78(7) | 233.087(8) | [62] |
86 | Rn | Radon | -0.7(2) | -68(20) | est.[3] |
87 | Fr | Francium | 0.486 | 46.89 | est.[63][33] |
88 | Ra | Radium | 0.10 | 9.648 5 | est.[64][33] |
89 | Ac | Actinium | 0.35 | 33.77 | est.[33] |
90 | Th | Thorium | 1.17 | 112.72 | est.[65] |
91 | Pa | Protactinium | 0.55 | 53.03 | est.[65] |
92 | U | Uranium | 0.53 | 50.94 | est.[65] |
93 | Np | Neptunium | 0.48 | 45.85 | est.[65] |
94 | Pu | Plutonium | -0.50 | -48.33 | est.[65] |
95 | Am | Americium | 0.10 | 9.93 | est.[65] |
96 | Cm | Curium | 0.28 | 27.17 | est.[65] |
97 | Bk | Berkelium | -1.72 | -165.24 | est.[65] |
98 | Cf | Californium | -1.01 | -97.31 | est.[65] |
99 | Es | Einsteinium | -0.30 | -28.60 | est.[65] |
100 | Fm | Fermium | 0.35 | 33.96 | est.[65] |
101 | Md | Mendelevium | 0.98 | 93.91 | est.[65] |
102 | No | Nobelium | -2.33 | -223.22 | est.[65] |
103 | Lr | Lawrencium | -0.31 | -30.04 | est.[65] |
111 | Rg | Roentgenium | 1.565 | 151.0 | calc.[66] |
113 | Nh | Nihonium | 0.69 | 66.6 | calc.[67] |
115 | Mc | Moscovium | 0.366 | 35.3 | calc.[67] |
116 | Lv | Livermorium | 0.776 | 74.9 | calc.[67] |
117 | Ts | Tennessine | 1.719 | 165.9 | calc.[67] |
118 | Og | Oganesson | 0.056(10) | 5.403 18 | calc.[68] |
119 | Uue | Ununennium | 0.662 | 63.87 | calc.[63] |
120 | Ubn | Unbinilium | 0.021 | 2.03 | calc.[69] |
121 | Ubu | Unbiunium | 0.57 | 55 | calc.[33] |
Molecules
The electron affinities Eea of some molecules are given in the table below, from the lightest to the heaviest. Many more have been listed by Rienstra-Kiracofe et al. (2002). The electron affinities of the radicals OH and SH are the most precisely known of all molecular electron affinities.
Second and third electron affinity
Z | Element | Name | Electron affinity (eV) | Electron affinity (kJ/mol) | References |
---|---|---|---|---|---|
7 | N− | Nitrogen | -6.98 | -673 | [70] |
7 | N2- | Nitrogen | -11.09 | -1070 | [70] |
8 | O− | Oxygen | -7.71 | -744 | [70] |
15 | P− | Phosphorus | -4.85 | -468 | [70] |
15 | P2- | Phosphorus | -9.18 | -886 | [70] |
Bibliography
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- Updated values can be found in the NIST chemistry webbook for around three dozen elements and close to 400 compounds.
Specific molecules
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