Electron Affinities Periodic Table of the Elements

Periodic Table with Electron Affinities

 

The electron affinity of an atom is the energy released when an electron is added to it. It is related to the atom's ionization energy and electronegativity. The basic difference between ionization energy and electron affinity is that ionization energy measures the ease with which an atom loses an electron, while electron affinity measures the ease with which an atom gains an electron.

 

Table 1: Periodic Table with Electron Affinities (kJ/mol) of gaseous atoms of the elements

1	2	3	4	5	6	7	8	9	10	11	12
H 72.77
Li 59.63	Be < 0
Na 52.87	Mg < 0
K 48.38	Ca 2.0	Sc 18.1	Ti 7.6	V 50.7	Cr 64.3	Mn < 0	Fe 15.7	Co 63.8	Ni 111.5	Cu 118.5	Zn < 0
Rb 46.88	Sr 4.6	Y 29.6	Zr 41.1	Nb 86.2	Mo 72.0	Tc ˜53	Ru ˜100	Rh 110	Pd 51.8	Ag 125.6	Cd < 0
Cs 45.50	Ba 13.95	La ˜50	Hf ˜0	Ta 31.1	W 78.6	Re ˜14	Os ˜106	Ir 151	Pt 205.1	Au 222.7	Hg < 0
Fr 44.00	Ra > 0	Ac 1.1	Th 1.3	Pa	U	Np

 

Table 1 (continued...)

13	14	15	16	17
B 26.7	C 121.85	N -7	O 140.98	F 328.0
Al 42.6	Si 133.6	P 72.03	S 200.41	Cl 349.0
Ga 29	Ge ˜120	As ˜80	Se 194.97	Br 324.7
In 29	Sn ˜120	Sb 103	Te 190.15	I 295.2
Tl ˜20	Pb 35.1	Bi 91.3	Po ˜180	At ˜270

 

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Relevant Posts

Electronegativities Periodic Table of the Elements

 

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References

1. CRC Handbook of Chemistry and Physics, 52nd edition, The Chemical Rubber Co., (1971)
2. David W. Oxtoby, H.P. Gillis, Alan Campion, “Principles of Modern Chemistry”, Sixth Edition, Thomson Brooks/Cole, 2008
3. Steven S. Zumdahl, “Chemical Principles”  6th Edition, Houghton Mifflin Company, 2009

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Key Terms

electron affinities, electronegativity difference, electron affinity, ionization energy,

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