Masataka Ogawa

Masataka Ogawa (小川 正孝, Ogawa Masataka, 21 February 1865 – 11 July 1930) was a Japanese chemist mainly known for the claimed discovery of element 43 (later known as <a href="/facts/Technetium/MGYWNI5d">technetium</a>), which he named nipponium. In fact, he had discovered, but misidentified, element 75 (later called <a href="/facts/Rhenium/TzyqJYEn">rhenium</a>).
After graduating from the <a href="/facts/University_of_Tokyo/Td0xnQDF">University of Tokyo</a>, he studied under <a href="/facts/William_Ramsay/fGzWlHlP">William Ramsay</a> in London, where he worked on the analysis of the rare mineral <a href="/facts/Thorianite/Xy7LefW9">thorianite</a>. He extracted and isolated a small amount of an apparently unknown substance from the mineral, which he announced as the discovery of element 43, naming the newly discovered element nipponium. He published his results in 1909 and a notice was also published in the <a href="/facts/Journal_of_the_American_Chemical_Society/MbBz2Jo5">Journal of the American Chemical Society</a>. For this work, he was awarded a doctorate and the highest prize of the <a href="/facts/Chemical_Society_of_Japan/DqpTn1WY">Tokyo Chemical Society</a>. However, no other researchers were able to replicate his discovery, and the announcement was forgotten.
Ogawa served as president of <a href="/facts/Tohoku_University/ec7m7vYy">Tohoku University</a> between 1919 and 1928. While the name nipponium could not be reused for another element, element 113 was also discovered by a team of Japanese scientists and is now named <a href="/facts/Nihonium/sb09p5dv">nihonium</a>, also after Japan. The name was chosen in respectful homage to Ogawa's work.

Masataka Ogawa open-in-new

Masataka Ogawa