Whose Research Unlocked the Atom?

New Zealand-born physicist Ernest Rutherford (1871-1937) transformed our understanding of the atom. In 1911, his gold-foil experiment — firing alpha particles at a thin gold sheet — produced shocking results: most particles passed straight through, but a few bounced back at large angles. Rutherford concluded that the atom mass and positive charge are concentrated in a tiny, dense nucleus, with electrons orbiting at a distance. He also performed the first artificial nuclear transmutation in 1917, converting nitrogen into oxygen by bombarding it with alpha particles. He won the Nobel Prize in Chemistry in 1908 (for his work on radioactive decay) and mentored numerous future Nobel laureates.