For four years, James Chadwick ... the lab. Chadwick's own research focused on radioactivity. In 1919 Rutherford had discovered the proton, a positively charged particle within the atom's nucleus.

He also theorized that there was a neutral particle within the nucleus, which James Chadwick ... with a negative one-third charge). The theory of the atom dates at least as far back as 440 ...

For four years, James Chadwick ... the lab. Chadwick's own research focused on radioactivity. In 1919 Rutherford had discovered the proton, a positively charged particle within the atom's nucleus.

While the film focuses on the eponymous American physicist spearheading Allied efforts to make the atomic bomb, the team also involved British Nobel Prize winner James Chadwick. Yet little is ...