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Hantaro Nagaoka Contribution to the Atomic Theory
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Challenges and Problems
Electrons don't follow a specific orbit like rings of saturn.Instead the exist in an electron cloud or shell.
Multiple electron "shells" (instead of rings) are now known to be there. There can be a maximum of 8 electrons per shell (except inner shell, there can only be 2). That fact was not Stated by Hantaro Nagaoka.
Nagaoka's Saturnian was not widely accepted as Thompson's Plum Pudding Model, since Nagaoka wasn't well known. However after physicist Neils Bohr explained that Nagaoka's model was in fact more correct, other scientists started to consider the Saturnian Model.
Sources
http://www.japanese-greatest.com/technology/atomic-model.html
http://en.wikipedia.org/wiki/Hantaro_Nagaoka
http://link.springer.com/chapter/10.1007%2F978-3-540-70626-7_10
http://discoveringtheatomvincent.weebly.com/hantaro-nagaoka.html
http://www.scientificamerican.com/article/physicists-in-wartime-japan/
Plum Pudding Model and Saturnian Model
Hantaro Nagaoka's Life
Hantaro Nagaoka Saturnian Model of the Atom
Hantaro Nagaoka was a famous Japanese physicist who was very important to the atomic theory. He was also a pioneer of Japanese physics during the Meiji period. He was born on August 15,1865 in Nagasaki,Japan.
He studied at the University of Tokyo, and graduated in 1887. After that he worked with a British physicist named Cargill Gilston Knott, on magnetism. When Nagaoka traveled to Europe in 1893 he continued to learn at the Universities of Berlin, Vienna, and Munich. He also attended the First International Congress of Physicists in Paris. He heard a lady named Marie Curie talk about radioactivity and that sparked his interest in atomic physics.
After his studies he decided to do experiments of his own and became a teacher when he decided to move back to japan. Hantaro Nagaoka died on December 11,1950. He was 85.
- In 1903 a english physicist named J.J Thompson proposed "The Plum pudding Model of the atom". Thompson's model stated that the atom was a positive charged sphere with electrons scattered throughout it.
- However, Nagaoka disagreed. He proposed his own model where a positive center (Nucleus) was surrounded by rings of electrons.
- Nagaoka's model was given the name "The Saturnian Model" because it resembled the planet Saturn with its center with orbiting rings. Even though The Saturnian Model was wrong it opened the door for new ideas for other scientists.