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== Historia ==
Anno [[1815]] Anglicus chemicus [[Gulielmus Prout]] atomum hydrogenii unicam particulam fundamentalem esse postulabat. Anno [[1886]] physicus [[Eugenius Goldstein]] de ''radiatione forma nondum investigata'' scripsit<ref>{{cite journal |authors=Goldstein, E. |title=''Über eine noch nicht untersuchte Strahlungsform an der Kathode inducirter Entladungen'' |journal=Monatsberichte der Königlich Preussischen Akademie der Wissenschaften zu Berlin |year=1886 |month=Iul |pages=457-65 (II: 691-99) |url=https://books.google.de/books?id=vUsVAAAAYAAJ&pg=PA851&hl=de&source=gbs_toc_r&cad=3#v=onepage&q&f=false}}</ref>. Denique anno 1919 [[Ernestus Rutherford]] (''pater physicae nuclearis'', [[Praemium Nobelianum chemiae]] 1908) protonem ex atomo [[nitrogenium|nitrogenii]] eiectum observavit et notionem protonis usus est<ref>{{cite journal |authors=Rutherford E. |title=Collision of α particles with light atoms. IV. An anomalous effect in nitrogen |journal=The London, Edinburgh, and Dublin Philosophical Magazine and Journal of Science. Series 6 |year=1919 |month=Apr |volume=37 |issue=222 |pages=581-7 |url=https://zenodo.org/record/1430800#.X80YuaebqlM}}</ref>.
== Notae ==
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