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John Dalton
Came up with the Atomic theroy. 1.The atoms of a given element are different from those of any other element; the atoms of different elements can be distinguished from one another by their respective relative atomic weights.
2.All atoms of a given element are identical.
3.Atoms of one element can combine with atoms of other elements to form chemical compounds; a given compound always has the same relative numbers of types of atoms.
4.Atoms cannot be created, divided into smaller particles. -
Period: to
Atom timeline
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J.J Thompson
Discovered the Electron. -
Hantaro Nagaoka
Discovered a very massive nucleus (in analogy to a very massive planet) and electrons revolving around the nucleus, bound by electrostatic forces (in analogy to the rings revolving around Saturn, bound by gravitational forces). -
Ernest Rutherford
During the investigation of radioactivity he coined the terms alpha and beta in 1899 to describe the two distinct types of radiation emitted by thorium and uranium -
Niels Bohr
The Bohr model of the atom, the theory that electrons travel in discrete orbits around the atom's nucleus.
The shell model of the atom, where the chemical properties of an element are determined by the electrons in the outermost orbit.
The correspondence principle, the basic tool of Old quantum theory.
The liquid drop model of the atomic nucleus.
Identified the isotope of uranium that was responsible for slow-neutron fission - 235U.[10]
Much work on the Copenhagen interpretation of quantum mecha -
James Chadwick
Was working o the Manhattan project, creating the Atomic bombs for hiroshima and Nagasaki.
