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460
Democritus
Revolves around the atoms that are present in the atmosphere. These are about the atoms that are present in all the forms of existence. -
John Dalton
Dalton concluded that evaporated water exists in air as an independent gas. -
Ernest Rutherford
Conducted some experiments to search the problem of alpha particles scattering by the thin gold-leaf. Rutheford knew that the particles contain the 2e charge. -
J.J. Thompson
Thomson interpreted the deflection of the rays by electrically charged plates and magnets. -
Hantaro Nagaoka
electrons revolving around the nucleus, bound by electrostatic forces (in analogy to the rings revolving around Saturn, bound by gravitational forces).That is why he called his model the SaturnianModel -
Niels Bohr
He discovered that electrons traveled in orbits around the atom's nucleus that the chemical properties of the element was largely determined by the number of electrons in the outer orbits that an electron could drop from a higher-energy orbit to a lower one, emitting a photon (light quantum) of discrete energy. -
Werner Heisenberg & Erwin Schrodinger
The electron cloud model shows the probable locations of electron in an atom. The probability of finfing a n electron is higher in the denser regions of the cloud. -
James Chadwick
He proved neutrons. He concluded in his experiment that the particles produced were neutral because a charged object id not deflect their paths.
