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History of atomic theory has been listed as one of the Natural sciences good articles under the good article criteria. If you can improve it further, please do so. If it no longer meets these criteria, you can reassess it. | |||||||||||||||||||||||||||||||||||||||||||
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@Johnjbarton: The article says that Thomson measured the mass of an electron to be 1/8000 of a proton. But I looked through Thomson's paper and he didn't measure the mass, but the mass-to-charge ratio. When was the mass measured? Was it Milikan's oil drop experiment? If you measure the charge of an electron and you already know the mass-to-charge ratio, you can then calculate the mass. Kurzon (talk) 12:00, 14 May 2024 (UTC)
@Johnjbarton: In his 1899 paper, Thomson writes: "This mass is exceedingly small, being only about 1.4 × 10-3 of that of the hydrogen ion". Does that mean the electron is 1,400 time smaller than hydrogen, or 1/0.0014 times smaller? Kurzon (talk) 18:35, 14 May 2024 (UTC)
@Johnjbarton and Ajrocke: How did Thomson know the charge on a hydrogen ion is equal to the charge on an electron? Which papers did he lay out his proof? Kurzon (talk) 09:21, 15 May 2024 (UTC)
Well I don't think at the time Thomson knew that a hydrogen atom had just one electron. Kurzon (talk) 09:59, 15 May 2024 (UTC)
@Johnjbarton: Let's revisit this issue.
In an April 1911 paper, Ernest Rutherford estimated that the charge of an atomic nucleus, expressed as a multiplier of hydrogen's nuclear charge (e), is roughly half the atom's atomic weight, based on how various types of metal foil scattered alpha particles.
I think it should be "multiplier".Kurzon (talk) 18:30, 18 May 2024 (UTC)
I am concerned that this article no longer meets the good article criteria because there are uncited statements throughout the article, including entire paragraphs. Is anyone interested in fixing up this article? Z1720 (talk) 20:53, 5 October 2024 (UTC)
The article says;
With a ref to
While working on Rutherford atom I looked into many references discussing planetary models. Planetary models appeared before 1911, Rutherford's model was not planetary (he made no comment on the electrons), and the concept of associating planetary models with atom appeared long after 1911, in association with Bohr's model of circular orbits. Please see Bohr_model#Symbolism_of_planetary_atomic_models and the ref below.
The Britannia site has other errors, eg "Physicist Ernest Rutherford envisioned the atom as a miniature solar system,". A comprehensive history says "Rutherford did not specify the electronic arrangement..." Heilbron, John L. (1968). "The Scattering of α and β Particles and Rutherford's Atom". Archive for History of Exact Sciences. 4 (4): 247–307. doi:10.1007/BF00411591. ISSN 0003-9519. JSTOR 41133273.
I think this sentence should be removed despite the reference. Johnjbarton (talk) 23:11, 23 October 2024 (UTC)
I think we should alter the table of contents and add a bit of content to highlight models of the atom consistent with the title. Johnjbarton (talk) 17:35, 30 October 2024 (UTC)
Our section on "Dalton's Law of multiple proportions" here is almost as long as Law of multiple proportions. I think the section goes into too much detail for this article. We're covering almost 200 years of science across at least chemistry and physics in this article so it feels to me we should let the main article carry more of the Dalton details. Johnjbarton (talk) 18:18, 30 October 2024 (UTC)
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