In simple terms, that assertion is correct, but for those with an expertise in the field, the longer answer to who did it first is almost as complex as the science involved. After all, as particle ...

Prof. Thomson has calculated from the results of his experiments on very different substances that the mass of a negative corpuscle is about the five-hundredth part of the hydrogen atom.

There he met J.J. Thomson (who ... In 1909 he began experiments that were to change the face of physics. He discovered the atomic nucleus and developed a model of the atom that was similar to ...

Photo: Niels Bohr's research notes for his new atomic theory Rutherford's find came from a very strange experience. Everyone at that time imagined the atom as ... Rutherford's model wasn't quite ...

BBC Bitesize A simple model of an atom shows a nucleus orbited by a number of electrons In 1803, John Dalton's atomic theory brought ... Joseph John Thomson, a fellow Mancunian working the ...