Search results
Jan 19, 2016 · This was the basis of the atomic theory devised by English physicist J.J. Thompson in the late 19th an early 20th centuries. As part of the revolution that was taking place at the time, Thompson ...
Joseph John Thomson, better known as J. J. Thomson, was a British physicist who first theorized and offered experimental evidence that the atom is a divisible entity rather than the basic unit of matter, as was widely believed at the time. A series of experiments with cathode rays he carried out near the end of the 19th century led to his ...
John Dalton and the development of the atomic theory. By far Dalton’s most influential work in chemistry was his atomic theory. Attempts to trace precisely how Dalton developed this theory have proved futile; even Dalton’s own recollections on the subject are incomplete. He based his theory of partial pressures on the idea that only like ...
Apr 4, 2024 · Sydney Ross. John Dalton, English meteorologist and chemist, a pioneer in the development of modern atomic theory. His theory was notable for, among other things, positing that each element had its own kind of atom and that atoms of various elements vary in size and mass. Learn more about Dalton in this article.
Feb 25, 2020 · Joseph John Thomson’s contributions to science helped revolutionize the understanding of atomic structure. Although a mathematician and an experimental physicist by training, J. J. Thomson contributed extensively to the field of chemistry by discovering the existence of electrons, developing the mass spectrometer and determining the presence of isotopes.
J.J. Thomson, an English scientist, proposed the famous Thomson atomic model in the year 1898 just after the discovery of electrons. Plum Pudding Atomic Theory. Thomson proposed that the shape of an atom resembles that of a sphere having a radius of the order of 10-10 m. The positively charged particles are uniformly distributed with electrons ...
Development of atomic theory. The concept of the atom that Western scientists accepted in broad outline from the 1600s until about 1900 originated with Greek philosophers in the 5th century bce. Their speculation about a hard, indivisible fundamental particle of nature was replaced slowly by a scientific theory supported by experiment and ...
