Uranyl nitrate solution in glas flask, 1905.
© Science Museum / Science & Society Picture Library
A solution of uranyl nitrate (UO2(NO3)2 was prepared by Frederick Soddy (1877-1956), an English chemist, as part of his research into the transmutation of elements. It contains radium and is highly radioactive. Its bright yellow colour is typical of uranium compounds. Atomic transmutation is the changing of one type of atom into another as a result of a nuclear reaction.