Kasimir Fajans

Kasimir Fajans (Warsaw, May 27, 1887 - Ann Arbor, Michigan, May 18, 1975). Polish chemist and physicist.^,

He was a professor at the technical universities Karlsruhe and Munich, where he began his research in 1917. In 1935 he emigrated to the United States, where he taught at the University of Michigan and became a naturalized American.

He conducted important research on radioactivity and isotopy and developed the quantum theory of molecular electronic structure.

In 1913 he discovered the laws that regulate the displacement of the peak in radioactive transformations, at the same time as the British Frederick Soddy. These are now known as Soddy-Fajans laws.

He elaborated some rules (see Fajans Rules) referring to the chemical bond that bear his name, in addition to discovering a new atomic element, Protactinium together with his student, Oswald Helmuth Göhring.