Friedrich Ernst Dorn (1848, Guttstadt-1916, Halle) was a German physicist who discovered radon. Year 1848 (MDCCCXLVIII) was a leap year starting on Saturday (link will display the full calendar) of the Gregorian Calendar (or a leap year starting on Monday of the 12-day slower Julian calendar). ... Year 1916 (MCMXVI) was a leap year starting on Saturday (link will display the full calendar) of the Gregorian calendar (or a leap year starting on Friday of the 13-day-slower Julian calendar). ... Halle (also called Halle an der Saale (literally Halle on the Saale, and in some historic references is not uncommonly called Saale after the river) in order to distinguish it from Halle in North Rhine-Westphalia) is the largest city in the German State of Saxony-Anhalt. ... Not to be confused with physician, a person who practices medicine. ... For other uses, see Radon (disambiguation). ...

In 1885, at Halle University, Ernst Dorn took over the position of personal ordinarius professor for theoretical physics from Anton Oberbeck. Since Dorn was already an ordinarius professor ^[1], he was allowed to assume the title so as to not appear as having been demoted. ^[2] In 1895, Dorn succeeded Hermann Knoblauch at Halle as the ordinarius professor for experimental physics ^[3] and director of the physics institute. Dorn’s previous duties were taken over by Karl Schmidt, who had been a Privatdozent and was called as an extraordinarius professor for theoretical physics. ^[4] 1885 (MDCCCLXXXV) is a common year starting on Thursday of the Gregorian calendar (or a common year starting on Saturday of the 12-day slower Julian calendar). ... The Martin-Luther-University of Halle-Wittenberg is located in the German cities of Halle, Saxony-Anhalt and Wittenberg. ... The meaning of the word professor (Latin: [1]) varies. ... Anton Oberbeck (March 25, 1846 – October 23, 1900) was a German physicist. ... Year 1895 (MDCCCXCV) was a common year starting on Tuesday (link will display full calendar) of the Gregorian calendar (or a common year starting on Sunday of the 12-day-slower Julian calendar). ... Privatdozent (PD or Priv. ...

In 1900 Dorn discovered radon. He was studying the natural radioactive decay of radium, trying to put together details about what was happening to the mass when he detected the presence of a radioactive gas. Dorn initially called the gas "radium emanation". The gas was later called "niton", and, in 1923, it became "radon". Named after "the element radium", the name niton comes from the Latin word "nitens", meaning "shining". Friedrich Dorn is no longer alive =( Ğ: For the film, see: 1900 (film). ... For other uses, see Radon (disambiguation). ... Radioactive decay is the set of various processes by which unstable atomic nuclei (nuclides) emit subatomic particles. ... General Name, Symbol, Number radium, Ra, 88 Chemical series alkaline earth metals Group, Period, Block 2, 7, s Appearance silvery white metallic Standard atomic weight (226) g·mol−1 Electron configuration [Rn] 7s2 Electrons per shell 2, 8, 18, 32, 18, 8, 2 Physical properties Phase solid Density (near r. ...

Bibliography

• Jungnickel, Christa and Russell McCormmach. Intellectual Mastery of Nature. Theoretical Physics from Ohm to Einstein, Volume 1: The Torch of Mathematics, 1800 to 1870. University of Chicago Press, paper cover, 1990a.

• Jungnickel, Christa and Russell McCormmach. Intellectual Mastery of Nature. Theoretical Physics from Ohm to Einstein, Volume 2: The Now Mighty Theoretical Physics, 1870 to 1925. University of Chicago Press, Paper cover, 1990b.

Notes

1. ^ The position of ordinarius professor outranks that of extraordinarius professor, which is comparable to that of associate professor.
2. ^ Jungnickel, 1990b: p. 37
3. ^ In Germany, until the early 20th Century, experimental physics was considered to have a priority over theoretical physics, and therefore such positions were considered to be higher in rank. This changed with the mighty rise of German theoretical physics in the early 20th Century, especially through the activities of Max Born at the University of Göttingen and Arnold Sommerfeld at the University of Munich, who adroitly used experimental physics to test and develop their theories.
4. ^ Jungnickel, 1990b: p. 293