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==My diagram==
{{ping|Ajrocke|Johnjbarton}} I drew this diagram of the plum pudding model based on a 1905 diagram by JJ Thomson. The electrons are arranged in a pentagonal dipyramid, equidistant from the center. Is this a good diagram or misleading? [[User:Kurzon|Kurzon]] ([[User talk:Kurzon|talk]]) 19:15, 28 April 2024 (UTC)
:As a re-drawing of a historical diagram I think it is fine. I will tweak the caption. [[User:Johnjbarton|Johnjbarton]] ([[User talk:Johnjbarton|talk]]) 15:24, 29 April 2024 (UTC)
::Should all the electrons be the same distance from the center of the sphere? I wonder if the peaks of the pyramids should be a different distance. [[User:Kurzon|Kurzon]] ([[User talk:Kurzon|talk]]) 08:48, 12 July 2024 (UTC)
:::The diagram looks like the ones in Thomson's paper. [[User:Johnjbarton|Johnjbarton]] ([[User talk:Johnjbarton|talk]]) 00:37, 13 July 2024 (UTC)
::::Have you seen one that shows multi-shell electrons? I have heard of the "Thomson problem" in mathematics but all the diagrams I find constrain the electrons to the surface of the sphere. [[User:Kurzon|Kurzon]] ([[User talk:Kurzon|talk]]) 06:52, 13 July 2024 (UTC)
:::::I have not see such a diagram. Thomson's analysis of the multi-ring case was very limited. Above 6 electrons he finds that stability requires adding electrons in the center of the atom. Above 9 electrons the number of electrons in the center increase until at 15 he needs 15 in the center. (Recall that as more electrons are added the positive sphere also increases in strength). The electrons in the center then repel, leading to an inner ring. By this analysis he gets multi-rings. But he cannot do stability calculations on multiple rings, he's just guessing at this point.
:::::Bohr later said the equivalent of "he's making stuff up". Pais notes that Thomson generally considered physical models to be stories useful for generating ideas rather than the basis of quantitative analysis. (I can something about this to the article if you think it useful). And note that the great success of Bohr's later shell model follows the idea of rings of special stability. [[User:Johnjbarton|Johnjbarton]] ([[User talk:Johnjbarton|talk]]) 16:25, 13 July 2024 (UTC)
::::::Nobody has tried a computer simulation? [[User:Kurzon|Kurzon]] ([[User talk:Kurzon|talk]]) 18:20, 13 July 2024 (UTC)
:::::::Perhaps if we expand the section on the Thomson problem one will come up. [[User:Johnjbarton|Johnjbarton]] ([[User talk:Johnjbarton|talk]]) 02:25, 14 July 2024 (UTC)
:It looks fine to me.[[User:Ajrocke|Ajrocke]] ([[User talk:Ajrocke|talk]]) 17:56, 30 April 2024 (UTC)
[[File:Thomson atom seven electrons.svg|right|thumb]]
== Lead sentence is inappropriate. ==
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