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A7: Electron Affinities

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.