_(2).jpg)
Ernest Rutherford
1871–1937 · Physicist
A New Zealand-born physicist whose experiments revealed that atoms have a tiny, dense nucleus — the foundation of all nuclear physics.
“It was quite the most incredible event that has ever happened to me in my life.”
Why is this scientist famous?
Discovering the nuclear structure of the atom and pioneering the field of nuclear physics.
Rutherford's work revealed that almost all of an atom's mass and positive charge are concentrated in a tiny nucleus. His research on radioactivity, atomic structure and artificial nuclear reactions helped establish nuclear physics and transformed scientists' understanding of matter.
Ernest's story
Early Life
Born on a farm near Brightwater, New Zealand, Rutherford was the fourth of twelve children. He won a scholarship to Canterbury College in Christchurch, where he earned three degrees and began investigating radio waves. In 1895 he won a second scholarship to Cambridge University's Cavendish Laboratory, where he worked under J.J. Thomson, the discoverer of the electron.
Radioactivity and Half-Life
Rutherford distinguished alpha and beta radiation in 1898 while still working at Cambridge. At McGill University in Montreal, he continued investigating radioactivity. Working with chemist Frederick Soddy, he helped establish that radioactive elements decay at characteristic rates and can transform into other elements. This work overturned the old idea that atoms were permanently indivisible and unchangeable. Rutherford received the 1908 Nobel Prize in Chemistry for his investigations into the disintegration of elements and the chemistry of radioactive substances.
The Nuclear Atom
In Manchester, Hans Geiger and Ernest Marsden carried out scattering experiments under Rutherford's direction. In 1909 they found that although most alpha particles passed through thin metal foil, a small number were deflected through very large angles. Rutherford spent more than a year interpreting the result and in 1911 proposed that almost all of an atom's mass and positive charge are concentrated in a tiny central nucleus, with most of the atom consisting of empty space. His nuclear model replaced J. J. Thomson's earlier 'plum pudding' model and helped pave the way for Niels Bohr's later atomic model.
Legacy
Rutherford carried out experiments beginning in 1917 that led to the first artificial transmutation of one element into another, using alpha particles to transform nitrogen nuclei, and he mentored a remarkable generation of physicists including Niels Bohr, James Chadwick, and Otto Hahn. He was knighted in 1914, elevated to the peerage as Lord Rutherford in 1931, and is widely regarded as the father of nuclear physics. He died in Cambridge in 1937 and is buried in Westminster Abbey near Newton and Darwin.
What did they discover?
The Nuclear Atom
Experiments performed by Hans Geiger and Ernest Marsden under Rutherford's direction revealed unexpected large-angle scattering of alpha particles. Rutherford interpreted the results and in 1911 proposed that atoms contain a tiny, dense, positively charged nucleus surrounded by mostly empty space.
Radioactive Half-Life
Helped establish that radioactive substances decay at characteristic rates, developing the concept of half-life with Frederick Soddy and helping make radioactive dating possible.
Alpha and Beta Radiation
Identified and named two distinct types of radiation emitted by radioactive materials, and showed that alpha particles are helium nuclei.
First Artificial Nuclear Reaction
In experiments begun in 1917 and published in 1919, Rutherford bombarded nitrogen with alpha particles and observed the production of hydrogen nuclei, demonstrating the first artificial transmutation of one element into another.
Amazing facts
Although best known as a physicist, Rutherford received the 1908 Nobel Prize in Chemistry for his work on radioactive substances and the transformation of elements.
The gold foil experiment was actually performed by his students Geiger and Marsden — Rutherford interpreted the results.
Element 104, rutherfordium, is named in his honour.
He appeared on New Zealand's $100 banknote.
Scientists who worked with or studied under Rutherford included future Nobel laureates Niels Bohr and James Chadwick.
Rutherford compared the surprising backward scattering of alpha particles to firing a shell at tissue paper and having it bounce back.
Timeline
Born near Brightwater, New Zealand
Won a scholarship to the Cavendish Laboratory at Cambridge
Distinguished alpha and beta radiation while working at Cambridge, before moving to McGill University in Montreal
Received the Nobel Prize in Chemistry for work on radioactivity
Proposed the nuclear model of the atom from the gold foil experiment
Began experiments that led to the first artificial transmutation of nitrogen
Became director of the Cavendish Laboratory at Cambridge
Died in Cambridge and was buried in Westminster Abbey
Awards & honours
Related Super Scientists
Niels Bohr
1885–1962 · Physicist
Developed the Bohr model of the atom and made foundational contributions to quantum mechanics.
Marie Curie
1867–1934 · Physicist & Chemist
Pioneering the study of radioactivity and discovering the elements polonium and radium with Pierre Curie.
Lise Meitner
1878–1968 · Physicist
Made crucial contributions to the discovery of nuclear fission and, with Otto Frisch, provided its physical explanation.
Articles about this scientist
Inside the Atom: How Scientists Discovered Atomic Structure
Follow Dalton, Thomson, Rutherford, Bohr and Chadwick as experiments transformed the atom from a simple idea into the nuclear model taught today.
The Discovery of Radioactivity
A cloudy week in Paris helped reveal that atoms were not as stable and indivisible as scientists had assumed. What began with a photographic plate and uranium salts changed our picture of matter.