.
Russell and Sigurd Varian developed the first Klystron tube in the US.
Linus Pauling publishes The Nature of the Chemical Bond, a compilation of a decades worth of work on chemical bonding. It is one of the most important modern chemical texts. It explains hybridization theory, covalent bonding and ionic bonding as explained through electronegativity, and resonance as a means to explain, among other things, the structure of benzene
Magnetic Moment of Neutron, Alvarez
Discovery of Francium (Marguerite Catherine Perey)
Nuclear Fission Theory, O. Frisch and L. Meitner
Chandrasekhar limit
Vitamin K Synthesis
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19 September 1939 discovery of 2638 Gadolin
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28 February 1939 Birth of Daniel Chee Tsui
7 May 1939 Birth of Sidney Altman
30 September 1939 Birth of Jean-Marie Lehn
7 November 1939 Death of Ralph Allen Sampson in Bath, England
1939 Death of Sören Sörensen
Nobel Prize
Physics to Ernest Orlando Lawrence "for the invention and development of the cyclotron and for results obtained with it, especially with regard to artificial radioactive elements"
Chemistry to Adolf Friedrich Johann Butenandt "for his work on sex hormones" and Lavoslav (Leopold) Stjepan Ruzicka "for his work on polymethylenes and higher terpenes"
Physiology or Medicine to Gerhard Domagk "for the discovery of the antibacterial effects of prontosil"
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