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Atom History Timeline

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Lap Nguyen

on 13 September 2013

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Transcript of Atom History Timeline

Atom History Timeline
The atomists held that three are two fundamentally different kinds of realities composing the natural world, atom and void. Atoms, from the Greek adjective atomos or atomon,'indivisible,' are infinite in number and various in size and shape, and perfectly solid, with no internal gaps. They move about in an infinite void.
Democritus 400B.C.
John Dalton 1803
1) All matter is made of atoms. Atoms are indivisible and indestructible.
2) All atoms of a given element are identical in mass and properties.
3) Compounds are formed by a combination of two or more different kinds of atoms.
4) A chemical reaction is a rearrangement of atoms.
J.J. Thomson 1897
Found the Electron particles
given off by the cathode; a base unit of negative electricity

Raisin Pudding Model -
Matter is electrically neutral and electrons are much lighter than atoms.
By: Lap Nguyen, Bryan Tran, Marc Sechrist
Robert Millikan 1908
He did the oil drop experiment and found the charge of the electron.
Earnest Rutherford 1909
He did the gold-foil experiment and used the results to state that all the mass of an atom were in a small positively-charged ball at the center of the atom.
Niels Bohr 1913
Bohr proposed a theory for the hydrogen atom based on electrons travel around the nucleus in a number of discrete stable orbits determined by quantum conditions.

Erwin Schrodinger 1926
He proposed a wave equation that describes the form of the probability waves that govern the motion of small particles and how these waves are altered by external influences.
James Chadwick 1931
He proved that neutrons, neutral particles in the nucleus that made up approximately
half the mass of an atom, did exist.
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