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John Dalton
Dalton's fascination with gases gradually led him to formally assert that every form of matter (whether solid, liquid or gas) was also made up of small individual particles. He referred to the Greek philosopher Democritus of Abdera's more abstract theory of matter, which had centuries ago fallen out of fashion, and borrowed the term "atomos" or "atoms" to label the particles -
Ernest Rutherford
He graduated M.A. in 1893 with a double first in Mathematics and Physical Science and he continued with research work at the College for a short time, receiving the B.Sc. degree the following year. That same year, 1894, he was awarded an 1851 Exhibition Science Scholarship, enabling him to go to Trinity College, Cambridge, as a research student at the Cavendish Laboratory under J.J. Thomson. In 1897 he was awarded the B.A. Research Degree and the Coutts-Trotter Studentship of Trinity College. -
J. J Thomson
Joseph John J.J. Thomson's contribution tot he atomic theory is that he was able to identify the existence of electrons in an atom. The meant that atoms are not invisible and could be seen. His theory also suggested that atoms where spherical and had a positive charge.
n 1897 Thomson showed that cathode rays were composed of a previously unknown negatively charged particle, and thus he is credited with the discovery and identification of the electron; and, in a broader sense, with the discovery of the first -
James Chadwick
James ChadwickIn 1932, Chadwick made a fundamental discovery in the domain of nuclear science: he proved the existence of neutrons - elementary particles devoid of any electrical charge. In contrast with the helium nuclei (alpha rays) which are charged, and therefore repelled by the considerable electrical forces present in the nuclei of heavy atoms, this new tool in atomic disintegration need not overcome any electric barrier and is capable of penetrating and splitting the nuclei of even the heaviest element -
Democritus
Democritus The philosopher Democritus through his interlocutor Hermogenes speaks of the concepts of fullness and emptiness. The same can be said of Protagoras the anti-geometrician who irreverently maintained that "Man is the measure of all things": what they are and how they are, what they are not and how they are not. -
Niels Bohr
Niels Bohr
He discovered the electron and radioactivity at the end of the 19th centurey, which led to a different models of the atom. I
In 1913 He proposed a theory which was based on the quantum theory that its energy was transferred to a certain defiened quantities.
