The history of the atom l.jpg
This presentation is the property of its rightful owner.
Sponsored Links
1 / 15

THE HISTORY OF THE ATOM PowerPoint PPT Presentation


  • 92 Views
  • Uploaded on
  • Presentation posted in: General

THE HISTORY OF THE ATOM. Greek Philosophers (400 B.C.). Aristotle- believed the everything was made of the 4 elements (air, fire, water, and land). Each substance contained a varying portion of each element.

Download Presentation

THE HISTORY OF THE ATOM

An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -

Presentation Transcript


The history of the atom l.jpg

THE HISTORY OF THE ATOM


Greek philosophers 400 b c l.jpg

Greek Philosophers (400 B.C.)

  • Aristotle- believed the everything was made of the 4 elements (air, fire, water, and land). Each substance contained a varying portion of each element.

  • Democritus-believed everything was made of invisible and indivisible particles called “atomus” = ATOMS


Ben franklin 1748 l.jpg

Ben Franklin -1748

Determined there were positive and negative charges in nature.


Antoine lavoisier 1790 l.jpg

Antoine Lavoisier-1790

Law of conservation of matter- matter isneither created nor destroyed in anyprocess (you did anexperiment with the test tube and the flask)


Joseph louis proust 1799 l.jpg

Joseph Louis Proust - 1799

Law of constant composition - any sample of agiven compound always contains the samepercent of each element by mass.


John dalton 1803 l.jpg

John Dalton-1803

Created the Atomic Theory of Matter

Contains 4 postulate:

  • Each element is made of invisible and indivisible particles called atoms. (Democritus) wrong

  • All atoms of an element are identical. wrong

  • Atoms can not be created or destroyed in a reaction.

    (Laviosier)

    4. A given compound always has the same relative numbers and kinds of atoms. (Proust)


Michael faraday 1839 l.jpg

Michael Faraday - 1839

  • Suggested there was a connection between the structure of the atom and electricity.


E goldstein 1886 l.jpg

E. Goldstein - 1886

Isolated the proton.


J j thomson 1896 l.jpg

J.J. Thomson - 1896

Isolated the electron. (cathode tube in the journal)


Henri becquerel 1896 l.jpg

Henri Becquerel - 1896

Accidentally discovered that uranium gave off invisible rays. Photo plates were developed when put close to the sample of uranium. (journals)


Marie and pierre curie 1898 l.jpg

Marie and Pierre Curie - 1898

  • Named Becquerel’s invisible rays “radiation”.

  • Isolated the radioactive elements polonium and radium.


Ernest rutherford 1909 l.jpg

Ernest Rutherford - 1909

  • Isolated alpha and beta radiation.

  • Found all of the atom’s protons were in the center of the atom and called this the nucleus. (gold foil experiment in journal)


Robert millikan 1909 l.jpg

Robert Millikan - 1909

Found the mass (grams) and the charge (columbs) of the electron. (Famous oil drop experiment done at he University of Chicago.)


Niels bohr 1911 l.jpg

Niels Bohr - 1911

Proved electrons were in energy levels around the nucleus. (The current model changes part of Bohr’s idea.)


James chadwick 1932 l.jpg

James Chadwick - 1932

Found the nucleus of the atom also contained neutral particles; he called them neutrons.


  • Login