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Jan 1, 1000
Early Greek models- Democritus
According to ancient reports, Democritus was born about 460 BCE
Democritus was one of the two founders of ancient atomist theory. His exact contributions are difficult to disentangle from his mentor Leucippus, as they are often mentioned together in texts. Their speculation on atoms, taken from Leucippus, bears a passing and partial resemblance to the nineteenth-century understanding of atomic structure that has led some to regard Democritus as more of a scientist than other Greek philosophers -
Mar 1, 1200
Medieval Alchemist
A medieval alchemist would sometimes spend many years trying to discover new components. For alchemists, everything was composed of four elements - fire, water, air and earth; exactly what Empedocles said centuries before. -
John Dalton
He is best known for his pioneering work in the development of modern atomic theory, and his research into colour blindness (sometimes referred to as Daltonism, in his honour).
In 1800, Dalton became a secretary of the Manchester Literary and Philosophical Society, and in the following year he orally presented an important series of papers, entitled "Experimental Essays" on the constitution of mixed gases; on the pressure of steam and other vapours at different temperatures, both in a vacuum an -
Henri Becquerel
Antoine Henri Becquerel was a French physicist, Nobel laureate, and the discoverer of radioactivity along with Marie Curie and Pierre Curie, for which all three won the 1903 Nobel Prize in Physics. In 1896, his previous work was overshadowed by his discovery of the phenomenon of natural radioactivity. -
Joseph John Thomson
Thomson (1856–1940) discovered the electron in a series of experiments designed to study the nature of electric discharge in a high-vacuum cathode-ray tube, an area being investigated by numerous scientists at the time. -
Ernest Rutherford
Ernest Rutherford was a chemist and physicist who became known as the father of nuclear physics.[1] In early work he discovered the concept of radioactive half life, proved that radioactivity involved the transmutation of one chemical element to another, and also differentiated and named alpha and beta radiation. -
Niels Bohr
Niels Bohr was a physicist who made fundamental contributions to understanding atomic structure and quantum mechanics, for which he received the Nobel Prize in Physics in 1922.Contributions to Physics and Chemistry
In the spring of 1912 he was at work in Professor Rutherford's laboratory in Manchester, where just in those years such an intensive scientific life and activity prevailed as a consequence of that investigator's fundamental inquiries into the radioactive phenomena. Having there c -
James Chadwick
Sir James Chadwick was an English Nobel laureate in physics awarded for his discovery of the neutron.
In 1913 Chadwick went and worked with Hans Geiger at the Technical University of Berlin. He also worked with Ernest Rutherford. He was in Germany at the start of World War I and was interned in Ruhleben P.O.W. Camp just outside Berlin. While he was interned, he had the freedom to set up a laboratory in the stables. With the help of Charles Ellis he worked on the ionization of phosphorus and also -
Marie and Pierre Curie
in 1898. Marie was finding that certain ores containing uranium or thorium had more radioactivity than pure uranium or thorium. She theorized that these ores included a substance that was a new chemical element. named the new element “polonium”.
