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W. Wien (Wied. Ann. lxv. p.440) and Ewers (Wied. Ann. lxix. p.187) have measured the ratio of m / e for the positive ions in such a tube, and found that it is of the same order as the value of m / e in ordinary electrolysis; Ewers has shown that it depends on the metal of which the cathode is made.
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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
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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
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In his 1899 paper, Thomson writes: "This mass is exceedingly small, being only about 1.4 Ă— 10 of that of the hydrogen ion". Does that mean the electron is 1,400 time smaller than hydrogen, or 1/0.0014 times smaller?
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Thus the carriers of positive electricity at low pressures seem to be ordinary molecules, while the carriers of negative electricity are very much smaller.
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Thomson measured e for ions and for photo-electrons. He measured m/e for cathode rays and photo-electrons. In his photoelectron paper he says
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1014:. In the quote above "multiplier" seems fine to me. The other sentence was different and anyway I removed it for other reasons.
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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?
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content on
Knowledge (XXG). If you would like to participate, you can edit the article attached to this page, or visit the
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on
Knowledge (XXG). If you would like to participate, please visit the project page, where you can join
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on
Knowledge (XXG). If you would like to participate, please visit the project page, where you can join
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Well I don't think at the time
Thomson knew that a hydrogen atom had just one electron.
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I didn't find 8000, but I did edit the m/e section for the electron based on
Whittaker.
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Hydrogen is simply the iconic atom. Both issues are related to atomic theory IMO.
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and you already know the mass-to-charge ratio, you can then calculate the mass.
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Doesn't this follow from charge neutrality? The hydrogen atom is neutral.--
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