Table shows electron affinity (i.e. the amount of energy released when an electron is added to atom) for most of chemical elements.

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Electron affinity#

Atomic number	Element name	Element symbol	Electron affinity [eV]
1	Hydrogen	H	0.754
2	Helium	He	-0.52
3	Lithium	Li	0.618
4	Beryllium	Be	-0.52
5	Boron	B	0.279
6	Carbon	C	1.2621136
7	Nitrogen	N	-11.09
8	Oxygen	O	-7.711
9	Fluorine	F	3.401
10	Neon	Ne	-1.2
11	Sodium	Na	0.547
12	Magnesium	Mg	-0.415
13	Aluminium	Al	0.432
14	Silicon	Si	1.389
15	Phosphorous	P	-9.183
16	Sulfur	S	-4.726
17	Chlorine	Cl	3.612
18	Argon	Ar	-1
19	Potassium	K	0.501
20	Calcium	Ca	0.024
21	Scandium	Sc	0.188
22	Titanium	Ti	0.084
23	Vanadium	V	0.527
24	Chromium	Cr	0.675
25	Manganese	Mn	-0.52
26	Iron	Fe	0.153
27	Cobalt	Co	0.662
28	Nickel	Ni	1.157
29	Copper	Cu	1.235
30	Zinc	Zn	-0.62
31	Gallium	Ga	0.43
32	Germanium	Ge	1.232
33	Arsenic	As	0.804
34	Selenium	Se	2.02
35	Bromine	Br	3.363
36	Krypton	Kr	-0.62
37	Rubidium	Rb	0.485
38	Strontium	Sr	0.052
39	Yttrium	Y	0.307
40	Zirconium	Zr	0.433
41	Niobium	Nb	0.917
42	Molybdenium	Mo	0.747
43	Technetium	Tc	0.55
44	Ruthenium	Ru	1.046
45	Rhodium	Rh	1.142
46	Palladium	Pd	0.562
47	Silver	Ag	1.304
48	Cadmium	Cd	-0.725
49	Indium	In	0.3
50	Tin	Sn	1.112
51	Antimony	Sb	1.047
52	Tellurium	Te	1.97
53	Iodine	I	3.059
54	Xenon	Xe	-0.83
55	Cesium	Cs	0.471
56	Barium	Ba	0.144
57	Lanthanum	La	0.47
58	Cerium	Ce	0.65
59	Praseodymium	Pr	0.962
60	Neodymium	Nd	1.916
61	Promethium	Pm	0.129
62	Samarium	Sm	0.162
63	Europium	Eu	0.864
64	Gadolinium	Gd	0.137
65	Terbium	Tb	1.165
66	Dysprosium	Dy	0.352
67	Holmium	Ho	0.338
68	Erbium	Er	0.312
69	Thulium	Tm	1.029
70	Ytterbium	Yb	-0.02
71	Lutetium	Lu	0.346
72	Hafnium	Hf	0.017
73	Tantalum	Ta	0.323
74	Tungsten	W	0.816
75	Rhenium	Re	0.06
76	Osmium	Os	1.1
77	Iridium	Ir	1.564
78	Platinum	Pt	2.125
79	Gold	Au	2.308
80	Mercury	Hg	-0.52
81	Thalium	Tl	0.377
82	Lead	Pb	0.356
83	Bismuth	Bi	0.942
84	Polonium	Po	1.9
85	Astatine	At	2.3
86	Radon	Rn	-0.725
87	Francium	Fr	0.486
88	Radium	Ra	0.1
89	Actinium	Ac	0.35
90	Thorium	Th	1.17
91	Protactinium	Pa	0.55
92	Uranium	U	0.53
93	Neptunium	Np	0.48
94	Plutonium	Pu	-0.5
95	Americium	Am	0.1
96	Curium	Cm	0.28
97	Berkelium	Bk	-1.72
98	Californium	Cf	-1.01
99	Einsteinium	Es	-0.3
100	Fermium	Fm	0.35
101	Mendelevium	Md	0.98
102	Nobelium	No	-2.33

Some facts#

The electronic affinity is amount of energy, that is released during the attachment of the electron to the neutral atom. As a result of such attachment, a negative ion (anion) is formed.
Electron affinity is related to electronegativity of elements. Simply speaking, the greater the affinity of electrons, the more eagerly the atoms of a given element join electrons to form ions (anions).
The electronic affinity is most often given in electron volts (eV) or in kilojoules per mole (kJ / mol).
Theoretically, the value of the electron affinity can be approximated using Koopmans theorem as energy of lowest unocuppied orbital. Such calculations can be made using quantum chemistry methods.
Electronic affinity is a property specific to a given element. However, it may be slightly different for individual isotopes.
When two atoms form a chemical compound, the electron cloud is shifted towards the element with a higher electron affinity. When this difference is large enough, the electron is virtually transferred from one atom to the other creating an ionic bond. This is the case, for example, in the case of sodium-chlorine (Na-Cl) bonding in sodium chloride.
Electronic affinity is measured (or calculated theoretically) for isolated atoms in gaseous state.
Analogically, it is possible to define the electron affinity for chemical compounds (molecules).

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