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It's strange that Thomson did not propose the existence of the proton in his atomic model. Wasn't there enough information at the time to suggest the existence of protons if not prove them? Physicists at the time speculated on the existence of "positive electrons" that carried the elementary unit of positive charge just as negative electrons carry the elementary negative charge. Hydrogen ions and alpha particles were positively-charged particles. Thomson did not know exactly how many electrons were in an atom so perhaps a hydrogen ion could contain some remaining electrons. I suppose the missing piece of the puzzle was the nucleus, where the positive charge existed separate from the negative charge and therefore could be probed separately. [[User:Kurzon|Kurzon]] ([[User talk:Kurzon|talk]]) 20:41, 12 October 2024 (UTC)
==Kepler?==
{{ping|Johnjbarton}}
<math>\theta = 2\arctan\frac{k q_1 q_2}{m v^2 b}</math>
Did Kepler come up with this equation? In the Rutherford scattering article, you mentioned Kepler in the part where we explain how Rutherford calculated the scattering angle.
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