Believed the atom are hard solid circular and invisible.
Facts :He was a philosopher
No subatomic particles/indivisible atoms
Most of his principles were right, he just didn't know about neutrons/isotopes
Said atoms of same element have same mass (NOT true because isotopes!)
Fun Fact:He identified the hereditary nature of red-green color blindness.
Discover the Periodic Table, Pycnometer, and Pyrocollodion.
Fun Fact: Russian chemist and inventor
Discovered electron Used cathode-ray tube
Plum pudding model -- electrons evenly distributed throughout the model.
Fun Fact:In 1908 he was knighted for his contributions to science and in 1912 he received the Order of Merit.
Discovered charge of an electron using oil drop apparatus
Fun Fact:When measuring the course of charged water droplets, they evaporated too quickly
Gold foil experiment Discovered nucleus Nucleus very dense and it is positive.
Fun Fact: Element 104, rutherfordium, is named after him.
Discovered electron's circular orbit explained the bright line emission spectrum with his planetary model.
Fun Fact: In April 1940, when Aage was 17, Denmark was invaded by the armed forces of Nazi Germany.
There was a repeating pattern to the properties of elements
Arranged the elements by increasing atomic mass.
Fun Fact:He was the first to use X-ray spectroscopy to measure the X-ray spectra of metals which was important in the invention of X-ray crystallography.
Modern atom interpretation: fuzzy cloud electron's whereabouts can only be known on average electron's position and momentum cannot be known at same time.
Fun Fact:His later work included study of plasma physics and the process of nuclear fusion.
The properties and structure of atomic nuclei, specifically the neutron.
Determined that some "strong force" holds the nucleus together, a force distinct from the electromagnetism.
Fun Fact:In 1945, the British Government knighted him for his wartime contribution, and he became Sir James Chadwick.
:Prepared the way towards the fission of uranium 235 and towards the creation of the atomic bomb.