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The information for gallium is wrong. It should be 28.9 not 42.5
The information for Silicon doesn't look right. Several sources online say the electron affinity should be 4.05 eV for Silicon. See, for instance, this document published by the silicon wafer manufacturer Virginia Semiconductor: http://www.virginiasemi.com/pdf/generalpropertiessi62002.pdf. The textbook "Semiconductor Device Fundamentals" by Robert F. Pierret lists the electron affinity of Silicon at 4.03 eV on page 478.
I totally agree with Si electron affinity. Should be 4.05 eV. Balinga's book has this value, Sze's book has this value also. Soathana (talk) 09:18, 17 March 2014 (UTC)
Gallium appears to be 41 kJ/mol ... The electron affinity of Si was measured by photodetachment microscopy (an atomic physics technique) in 2010 and found to be 1.389 5210(7) eV, see  (Chaibi et al.). That settles the case. It would have been extremely suprising anyway to find an electron affinity greater than those of the halogens. Both tables - in eV and in kJ/mol - actually need to be revised and merged together. Having separate tables is nonsense when one deals with one and the same quantity. I shall do this merging, keeping one column in eV and another one in kJ/mol, so as to make everybody happy, ASAP. Good night Chrisanion (talk) 21:19, 28 May 2015 (UTC)
The commenters' 4.05 eV values were not for the chemical electron affinity of Si but rather the surface electron affinity of an Si crystal as defined in solid state physics. Unfortunately these two concepts are both called "electron affinity" despite having completely different values. See the electron affinity article. I recall some talk on another talk page (I can't find it at the moment) that it might be also nice to tabulate the latter, however it's not clear that this is so useful since surface electron affinities depend on temperature, crystal face, etc. etc. and so only two significant figures are woth listing (just like work functions).
At the least it might be worth putting a note on the data page that the solid state electron affinities are not at all listed.
Thanks for volunteering to merge the tables! That was bugging me for a long time and the page will be much improved for your efforts. --Nanite (talk) 08:06, 29 May 2015 (UTC)