The Atomic Theory Timeline
By: Jessica Jang
442 BC:
Democritus was the first to think that all matter was made of indivisible
elements. He was also known to be the ‘father of modern science’. He
believed that it was impossible to destroy atoms, and that there were many
different kinds of atoms. This was when the later to be known as ‘The Atomic
Theory’ started.
1803:
John Dalton discovered The Atomic Theory.
http://www.youtube.com/watch?v=IdSUqsq1yY8
1896:
Wilhelm Rontgen discovered that some chemicals would glow under cathode rays.
This was the first discovery of X rays.
http://www.youtube.com/watch?v=0oy0fYeV764
1898:
JJ Thomson was the first to discover electrons.
http://www.youtube.com/watch?v=azXS0q3r9fY
1905:
Albert Einstein made a hypothesis about the particle of light. This is the base
of nuclear energy. The main use of nuclear energy is to produce electricity.
This is done by fission (when uranium atoms split). This makes heat, which
makes steam, which is used to make electricity.
1908:
Robert Millikan was the first to measure an electron for its charge. This is called an
elementary charge. He did this through an experiment, the ‘Oil Drop Experiment’.
http://www.youtube.com/watch?v=XMfYHag7Liw
1909:
Ernest Rutherford has made a theory on the structure
of atoms, what they look like. He was the first one to
discover the atomic nucleus.
1926:
Erwin Shrodinger discovered that electrons move in the form of a
wave. The Shrodinger Equation is named after him. This equation is
required for quantum mechanics.
1934:
Irene Curie and Frederic Joliot-Curie discovered that it’s possible
to create artificial radioactive elements. This means that it is very
well possible to change the atoms in matter.
1938:
Otto Hahn and Lise Meitner were the first to discover nuclear
fission. Nuclear fission is what creates energy, through the
separation of uranium atoms.
The Atomic Theory Timeline:
1908:
Robert Millikan
1898:
JJ Thomson
D
442:
Democritus
D
1803:
John Dalton
1896:
Wilhelm Rontgen
D
D
1909:
Ernest Rutherford
1938:
Otto Hahn and
Lise Meitner
D
1926:
Erwin Shrodinger
D
1905:
Albert Einstein
D
1934:
Irene Curie and
Frederic Joliot-Curie
http://www.softschools.com/timelines/atomic_theory_timeline/95/
http://www.worldsfamousphotos.com/2007/03/28/first-x-ray-1896/
http://dmr-astronomersclub.blogspot.ca/2012/10/electron-definition.html
http://www.olympusmicro.com/primer/lightandcolor/particleorwave.html
http://www.westinghousenuclear.com/Community/WhatIsNuclearEnergy.shtm
http://oldeloohuis.com/nuclearfusion.html
http://kjohnsonnz.blogspot.ca/2011/03/ernest-rutherford-new-zealander-who.html
http://germanhistorydocs.ghi-dc.org/sub_image.cfm?image_id=2112
http://www.123rf.com/photo_2481145_atom-with-electron-orbits.html
http://en.wikipedia.org/wiki/J._J._Thomson
http://www.universetoday.com/60058/democritus-atom/
http://commons.wikimedia.org/wiki/File:Democritus_by_Agostino_Carracci.jpg
http://the-history-of-the-atom.wikispaces.com/John+Dalton
http://en.wikipedia.org/wiki/Wilhelm_R%C3%B6ntgen
http://abyss.uoregon.edu/~js/21st_century_science/lectures/lec14.html
http://en.wikipedia.org/wiki/Robert_Andrews_Millikan
http://www.rottentomatoes.com/celebrity/albert_einstein/
http://www.nobelprize.org/nobel_prizes/physics/laureates/1933/schrodinger-facts.html