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The History of the Atom

Development of Atomic Theory from Democritus to Schrodinger
by

Julie Schneider

on 28 January 2014

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Transcript of The History of the Atom

460 BC
Democritus
1st to develop the idea that matter was made of particles called ATOMS.
Greek Word atomos which means "undivisible"
The History of Atomic Theory
1803
over 2000 years go by....
John Dalton
Proposed Atomic Theory
An atom is indivisible, indestructible, tiny sphere.

Determined that elements have unique atomic masses.
1911
Ernest Rutherford
Discovered the positively charged nucleus by probing atoms of gold foil with positively charged (alpha) particles.
Proposed Atomic Model with a very small, dense, positively charged nucleus with negatively charged electrons circling around the nucleus.
1898
JJ Thomson
Discovered the
electron
.
Proposed an atomic model known as the "plum pudding" model.
1913
Niels Bohr
Developed atomic model that placed electrons in specific energy levels to explain why they did not spiral toward and collide with the nucleus.
1932
James Chadwick
Discovered the
neutron
.
The discovery explained why the mass of an atom could not be attributed entirely to the mass of protons.
Discovery directly led to the development of the atomic bombs used in World War II.
1933
Erwin Schrodinger
Described electrons as waves with their probable location viewed as a cloud and introduced a mathematical model of the atom.
JJ Thomson's student
Discovered the
proton.
Thomson's model predicted that electrons and protons were evenly distributed throughout an atom.
Model:
Democritus believed that each type of matter was made from its own unique indivisible small pieces.
Full transcript