Electron Affinity of the Elements

Unit

The electron affinity of an atom is the energy released when an electron is added to a neutral gaseous atom to form a negative ion: X(g) + e⁻ → X⁻(g) + energy. This differs in sign convention from the enthalpy change of electron capture ionization.

Data available for 109 of 118 elements. Highest: Chlorine (348.6 kJ/mol). Lowest: Nobelium (-223.2 kJ/mol).

Visualize Electron Affinity in the periodic table →

118 elements

Electron Affinity of the Elements
		Symbol
17	Chlorine	Cl	348.6
9	Fluorine	F	328.2
35	Bromine	Br	324.5
53	Iodine	I	295.2
85	Astatine	At	233
79	Gold	Au	222.7
78	Platinum	Pt	205
16	Sulfur	S	200.4
34	Selenium	Se	195
52	Tellurium	Te	190.2
60	Neodymium	Nd	184.9
117	Tennessine	Ts	165.9
111	Roentgenium	Rg	151
77	Iridium	Ir	150.9
8	Oxygen	O	141
84	Polonium	Po	136
14	Silicon	Si	134.1
47	Silver	Ag	125.9
6	Carbon	C	121.8
29	Copper	Cu	119.2
32	Germanium	Ge	118.9
90	Thorium	Th	112.7
65	Terbium	Tb	112.4
28	Nickel	Ni	111.7
45	Rhodium	Rh	110.3
50	Tin	Sn	107.3
76	Osmium	Os	104
51	Antimony	Sb	101.1
44	Ruthenium	Ru	101
69	Thulium	Tm	99
101	Mendelevium	Md	93.91
59	Praseodymium	Pr	93
83	Bismuth	Bi	90.92
41	Niobium	Nb	88.52
74	Tungsten	W	78.76
33	Arsenic	As	77.65
116	Livermorium	Lv	74.9
1	Hydrogen	H	72.77
42	Molybdenum	Mo	72.1
15	Phosphorus	P	72.04
113	Nihonium	Nh	66.6
24	Chromium	Cr	65.21
27	Cobalt	Co	63.9
3	Lithium	Li	59.63
58	Cerium	Ce	55
46	Palladium	Pd	54.24
91	Protactinium	Pa	53.03
43	Technetium	Tc	53
57	Lanthanum	La	53
11	Sodium	Na	52.87
92	Uranium	U	50.94
23	Vanadium	V	50.91
19	Potassium	K	48.38
87	Francium	Fr	46.89
37	Rubidium	Rb	46.88
93	Neptunium	Np	45.85
55	Cesium	Cs	45.51
40	Zirconium	Zr	41.81
13	Aluminum	Al	41.76
49	Indium	In	37.04
81	Thallium	Tl	36.4
115	Moscovium	Mc	35.3
82	Lead	Pb	34.42
66	Dysprosium	Dy	33.96
100	Fermium	Fm	33.96
89	Actinium	Ac	33.77
71	Lutetium	Lu	33.4
67	Holmium	Ho	32.61
73	Tantalum	Ta	31
68	Erbium	Er	30.1
39	Yttrium	Y	29.6
31	Gallium	Ga	28.9
96	Curium	Cm	27.17
5	Boron	B	26.99
21	Scandium	Sc	18
72	Hafnium	Hf	17.18
62	Samarium	Sm	15.63
26	Iron	Fe	14.79
75	Rhenium	Re	14.5
56	Barium	Ba	13.95
64	Gadolinium	Gd	13.22
61	Promethium	Pm	12.45
63	Europium	Eu	11.2
95	Americium	Am	9.93
88	Radium	Ra	9.649
22	Titanium	Ti	7.289
118	Oganesson	Og	5.403
38	Strontium	Sr	5.023
20	Calcium	Ca	2.37
4	Beryllium	Be	0
7	Nitrogen	N	0
18	Argon	Ar	0
25	Manganese	Mn	0
30	Zinc	Zn	0
36	Krypton	Kr	0
48	Cadmium	Cd	0
54	Xenon	Xe	0
80	Mercury	Hg	0
86	Radon	Rn	0
70	Ytterbium	Yb	-1.93
99	Einsteinium	Es	-28.6
103	Lawrencium	Lr	-30.04
12	Magnesium	Mg	-40
2	Helium	He	-48
94	Plutonium	Pu	-48.33
98	Californium	Cf	-97.31
10	Neon	Ne	-116
97	Berkelium	Bk	-165.2
102	Nobelium	No	-223.2
104	Rutherfordium	Rf	—
105	Dubnium	Db	—
106	Seaborgium	Sg	—
107	Bohrium	Bh	—
108	Hassium	Hs	—
109	Meitnerium	Mt	—
110	Darmstadtium	Ds	—
112	Copernicium	Cn	—
114	Flerovium	Fl	—

Electron Affinity of the Elements

Related properties