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460
Democritus Picture
The image of the philosopher. -
Period: 460 to 370
Democritus
Democritus was a Greek philosopher. Deomcritus was born in Abdera, Greece in 460 BC. He was the first person to find out that matter cannot be infinitely divided. -
Period: to
John Dalton
Dalton was born in Eaglesfield, Cumbria, United Kingdom. English school teacher who revised the previous ideas involving atoms. Was also the beginning of the development of modern atomic theory. -
John Dalton Image
Dalton's photograph -
Period: to
Sir William Crookes
Crooks was born June 17th 1832 in London, United kingdom. One day when working in a dark Laboratory he noticed a green light within a cathode ray tube. His discovery led to the invention of the television. He discovered the element "Thallium". -
Sir William Crooks
Photograph of Crooks -
JJ Thomson
The image of Thomson -
Period: to
JJ Thomson
Thomson was born in Manchester, United Kingdom. This man determined that the ratio of the particles charged to its mass.He disproved Dalton's theory that atoms are invisible. -
Period: to
Robert Milikan
Milikan was honored the Nobel Prize for physics in 1923. He was an American experimental physicist. Designed an oil drop apparatus to determine the char ge of an electron. -
Robert Milikan
Photograph of Milikan -
Ernest Rutherford
Photograph of Rutherford -
Ernest Rutherford
Photograph of Rutherford -
Period: to
Ernest Rutherford
Rutherford was born in New Zealand but was of British decent. Studied how positively charged a-particles interacted with solid matter. He became known as the father of nuclear physics. He discovered that atoms have nuclei. -
Period: to
James Chadwick
Demonstrated that the nucleus had another interesting particle, the neutron. He won the Nobel prize of 1935 for his discovery. -
James Chadwick
Photograph of James Chadwick -
Aristotle Picture
The image of the Greek philosopher Aristotle. -
Period: to 322
Aristotle
Aristotle was born in 384 BC in stagria, Greece. Aristotle was a Greek philosopher. He completely disagreed with the idea that everything is made out of atoms. Instead he thought that everything was made up of the four elements, water, fire, earth, and air.
