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10 Scientist
Atom Theory
Niels Bohr- 1910
John Dalton- 1803
Democritus- 400BC
James Clerk Maxwell-1873
J.J.Thompson- 1897
His theory is as all matter is composed of extremely small
particles called atoms. Atoms of a given element are identical in
size, mass, and other properties.
He developed the Bohr model of the atom, in which he proposed that energy levels of electrons are discrete and that the electrons revolve in stable orbits around the atomic nucleus but can jump from one energy level (or orbit) to another. Although the Bohr model has been supplanted by other models, its underlying principles remain valid.
Supported the theory that nature’s basic
particle was an atom.
Proposed electric and magnetic fields filled the atom. His most notable achievement was to formulate the classical theory of electromagnetic radiation, bringing together for the first time .
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 subatomic particle. Thomson is also credited with finding the first evidence for isotopes of a stable (non-radioactive) element in 1913. He also made the the plum putting model.
Dimitri Mendeleev- 1860s
Ernest Rutherford- 1911
Isaac Newton-1704
J. Plucker-1859
Robert Millikan-1909
Millikan confirmed that the electron carries
a negative charge, and that all atoms of all elements must have electrons.
Put together a thin, gold foil with fast-moving alpha particles (a positively charged helium nucleus).
He placed the names of the each known element on a card along with its properties. He arranged the cards looking for periodic
patterns among the elements. Mendeleev grouped the elements that had similar properties together.
He made fundamental contributions to the field of analytical geometry and was a pioneer in the investigations of cathode rays that led eventually to the discovery of the electron.
Proposed a mechanical universe with small solid masses in motion.Newton also built the first practical reflecting telescope and developed a theory of color based on the observation that a prism decomposes white light into the many colors of the visible spectrum.