Electron affinity (data page)

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[edit] Elements

<< Chemical elements data references

Z Element Name Electron affinity (eV) References
1 H Hydrogen 0.754 195(19) [1]
3 Li Lithium 0.618 049(2) [2]
5 B Boron 0.279723(24) [3]
6 C Carbon 1.262118(20) [4]
8 O Oxygen 1.4611135(12) [5]
9 F Fluorine 3.4011895(25) [6]
11 Na Sodium 0.547926(25) [7]
13 Al Aluminium 0.43283(5) [8]
14 Si Silicon 1.3895213(13) [5]
15 P Phosphorus 0.746 609(9) [9]
16 S Sulfur 2.0771042(7) [10]
17 Cl Chlorine 3.612724(27) [11]
19 K Potassium 0.501459(12) [12]
20 Ca Calcium 0.02455(10) [13]
21 Sc Scandium 0.188(20) [14]
22 Ti Titanium 0.084(9) [15]
23 V Vanadium 0.526(12) [16]
24 Cr Chromium 0.67584(12) [17]
26 Fe Iron 0.151(3) [18]
27 Co Cobalt 0.6633(6) [19]
28 Ni Nickel 1.15716(12) [19]
29 Cu Copper 1.23578(4) [17]
31 Ga Gallium 0.43(3) [20]
32 Ge Germanium 1.232712(15) [4]
33 As Arsenic 0.8048(2) [21]
34 Se Selenium 2.020 604 6(11) [22]
35 Br Bromine 3.363590(3) [23]
37 Rb Rubidium 0.485916(20) [24]
38 Sr Strontium 0.05206(6) [25]
39 Y Yttrium 0.307(12) [14]
40 Zr Zirconium 0.427(14) [16]
41 Nb Niobium 0.894(25) [16]
42 Mo Molybdenum 0.7473(3) [17]
45 Rh Rhodium 1.14289(20) [19]
46 Pd Palladium 0.56214(12) [19]
47 Ag Silver 1.30447(3) [17]
49 In Indium 0.38392(6) [26]
50 Sn Tin 1.112067(15) [4]
51 Sb Antimony 1.047401(18) [27]
52 Te Tellurium 1.970876(7) [28]
53 I Iodine 3.0590463(38) [29]
55 Cs Caesium 0.47164(6) [3]
56 Ba Barium 0.14462(6) [30]
58 Ce Cerium 0.628(10) [31]
73 Ta Tantalum 0.323(12) [16]
74 W Tungsten 0.81626(8) [32]
75 Re Rhenium 1.138(8) [16]
76 Os Osmium 1.0778(12) [33]
77 Ir Iridium 1.56436(15) [34]
78 Pt Platinum 2.12510(5) [34]
79 Au Gold 2.308610(25) [35]
81 Tl Thallium 0.377(13) [36]
82 Pb Lead 0.364(8) [16]
83 Bi Bismuth 0.942362(13) [37]
84 Po Polonium 1.9(3) theoretical [38]
85 At Astatine 2.8(2) theoretical [38]


Electron affinity can be defined in two equivalent ways. First, as the energy [that is] released by adding an electron to a gaseous atom. (The energy -or electron affinity- is a scalar quantity and the direction of that energy -released- defines a reaction for which the change in energy ΔE is a negative quantity). The electron affinity is also defined in the case of electron capture as E(initial) – E(final) in order to maintain the positive value.[39] The reverse definition is that the electron affinity is the energy required to remove an electron from a gaseous anion (still a positive quantity, but in which the change in energy ΔE is also a positive quantity). Either convention can be used in practice, but must be consistent in according a scalar, i.e. positive number to the electron affinity. A negative sign appearing with a value for electron affinity indicates a change in direction, either that electron capture requires energy or removal releases energy.

Z Element Electron affinity
(kJ/mol)		 References
1 Hydrogen 72.77 [40][1]
3 Lithium 59.62 [7][41][2]
5 Boron 26.99 [3]
6 Carbon 121.78 [4]
8 Oxygen 141.004 [7][42][43]
9 Fluorine 328.165 [23][6]
11 Sodium 52.87 [7]
13 Aluminium 41.86 [8]
14 Silicon 134.07 [4][6]
15 Phosphorus 72.03 [7]
16 Sulfur 200.410 [42]
17 Chlorine 349 [44]
19 Potassium 48.38 [45][12]
20 Calcium 2.37 [13]
21 Scandium 18(2) [14]
22 Titanium 8.4(7) [15]
23 Vanadium 51. [7]
24 Chromium 65.2 [17]
26 Iron 14.6(3) [18]
27 Cobalt 64.0 [19]
28 Nickel 111.6 [19]
29 Copper 119.24 [17]
31 Gallium 41(3) [20]
32 Germanium 118.94 [4]
33 Arsenic 78.5(7) [46]
34 Selenium 194.97 [22]
35 Bromine 342.54 [23]
37 Rubidium 46.89 [24]
38 Strontium 5.02 [25]
39 Yttrium 30. [14]
40 Zirconium 41. [7]
41 Niobium 86(2) [7]
42 Molybdenum 72.3 [17]
44 Ruthenium 101.0 [47]
45 Rhodium 110.3 [19]
46 Palladium 54.24 [19]
47 Silver 125.86 [17]
49 Indium 39 [48]
50 Tin 107.30 [4]
51 Antimony 101.06 [27]
52 Tellurium 190.16 [7][28]
53 Iodine 295 [44]
55 Caesium 45.51 [45][49]
56 Barium 13.95 [30]
57 Lanthanum 45(2) [50]
58 Cerium 92(2) [51]
69 Thulium 99(2) [52]
71 Lutetium 33 [53]
73 Tantalum 31 [7]
74 Tungsten 79 [7][54]
76 Osmium 104.0 [33]
77 Iridium 150.9 [34]
78 Platinum 205.04 [34]
79 Gold 222.75 [7]
81 Thallium 36 [36]
82 Lead 35 [7]
83 Bismuth 90.92 [37]

[edit] Molecules

Molecule Electron affinity
(kJ/mol)		 References
Diatomics  
Dibromine 244 Janousek & Brauman (1979)
Dichlorine 227 Janousek & Brauman (1979)
Difluorine 297 Janousek & Brauman (1979)
Diiodine 246 Janousek & Brauman (1979)
Dioxygen 43 CRC Handbook
Iodine bromide 251 Janousek & Brauman (1979)
Lithium chloride 59 Janousek & Brauman (1979)
Nitric oxide 2 Janousek & Brauman (1979)
Triatomics  
Nitrogen dioxide 222 Janousek & Brauman (1979)
Sulfur dioxide 105 Janousek & Brauman (1979)
Larger polyatomics  
Benzene −110 Janousek & Brauman (1979)
p-Benzoquinone 129 CRC Handbook
Boron trifluoride 255 CRC Handbook
Nitric acid 59 Janousek & Brauman (1979)
Nitromethane 38 Janousek & Brauman (1979)
Phosphoryl chloride 134 Janousek & Brauman (1979)
Sulfur hexafluoride 138 CRC Handbook
Tetracyanoethylene 278 CRC Handbook
Tungsten hexafluoride 264 CRC Handbook
Uranium hexafluoride 280 CRC Handbook

[edit] Bibliography

  • CRC Handbook of Chemistry and Physics (62nd Edn. (1981); Weast, Robert C. (ed)). Boca Raton, FL: CRC Press. "Section E, General Physical Constants; Electron Affinities".
  • Janousek, B. K.; Brauman, J. I. (1979). in Gas Phase Ion Chemistry (Bowers, M. T. (Ed.)), Vol. 2. New York: Academic Press. p. 53.

[edit] References

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