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The History of the Atom
A Timeline by: Helena Brand, Nicole Reich,
      Matthias Roth and Max Klug
Democritus 400BC
The theory of Democritus was that everything is composed of atoms, which are physically
but not geometrically indivisible. All atoms would then be indestructible with empty space
between them. The atoms differ in shape and size. Democritus said, "The more any
indivisible exceeds, the heavier it is."




Aristotle 332BC
The theory of Democritus was that everything is composed of atoms, which are physically
but not geometrically indivisible. All atoms would then be indestructible with empty space
between them. The atoms differ in shape and size. Democritus said, "The more any
indivisible exceeds, the heavier it is."




Dalton 1802
As an english chemist, meteorologist and physicist, Dalton researched about the Atomic Theory. After
describing experiments to ascertain the pressure of steam at various points between 0 and 100 °C (32 and
212 °F), Dalton concluded from observations on the vapour pressure of six different liquids, that the
variation of vapour pressure for all liquids is equivalent, for the same variation of temperature, reckoning
from vapour of any given pressure.
Dobereiner 1817
Johann Wolfgang Dobereiner was a German chemist who is best known for work that
foreshadowed the periodic law for the chemical elements. He is known for the
Dobereiner Triads which followed a similar pattern.




Berzelius 1828
As a Swedish Chemist he worked out the modern technique chemical formula
notation.He also analyzed 2000 compounds to provide the experimental basis for the
atomic theory.Berzelius also introduced the symbolism with which chemical formulas
are still written




Newlands 1864
Newlands was born in London and was the son of a Scottish Presbyterian minister.He
was born in 1837 and he was a English Chemist.He was one of the first to propound the
conception of periodicity among the chemical elements.
Mendeleev 1869


 He arranged 63
     known
  elements to
    form the
 periodic table.
                      The elements
                     were arranged
                     by their atomic
      He even             mass.
 predicted several
  elements, that
     were not
   discovered at
     that time
Periodic Table of Elements
J.J. Thomson




  He was the first to discover the electron. On
the 30th of April 1897 he declared that there is   In 1998 he suggested that there is a „proton“.
   a particle lighter than the lightest atom,      However he could not prove this at that time.
 hydrogen. This particle is called the electron.
Millikan 1910
Millikan researched the charge of an electron. Once repeated this experiment several
times, he declared that results could be explained as integer multiples of a common
value (1.592*10^-19 coulomb) the charge of a single electron. This number is slightly
lower than the modern value of 1.602 176 53(14) x 10−19 coulomb due to Millikan's use
of inaccurate value of the viscosity of air.




Rutherford 1911
Ruthford designed a new model of the atom called the Rutherford Model. It disagreed
with the “Plum Pudding Model” from J.J. Thompson. It showed a new way of looking at
an atom. He discovered that there is an area in the atom, which has far more energy in
a small volume than the rest. This is now called the “nucleus” of an atom.




Moseley 1913
Looking at X-Rays passing through elements, Moseley corrected Mendeleev´s version
of the periodic table. He then ordered the elements by their atomic number.
Other Interesting Events at that Time

                          Scientist
                           Proust
                         1913-1927




            1909
                       Worldwar
         Plastic was
          invented
                        I begins       1927 BBC
                                      is founded

                         in 1914

                         Bothe and
                         Chadwick
                           1930
Citations                            Works Cited
"Aristotle." NNDB. N.p., n.d. Web. 26 Nov. 2012. <http://www.google.de/
   imgres?q=democritus&um=1&hl=en&sa=N&tbo=d&biw=1280&bih=610&tbm=isch&tbnid=U_euPH7WZ8jl1M:&imgrefurl=h
   ttp://www.nndb.com/people/790/000087529/&docid=mfkaIJFeC0MYxM&imgurl=http://www.nndb.com/people/790/
   000087529/
   democritus-1-sized.jpg&w=293&h=339&ei=HJGzUM6oE8fktQbVkoG4Cg&zoom=1&iact=hc&vpx=241&vpy=81&dur=60&hov
   h=242&hovw=209&tx=84&ty=90&sig=113953390841894950889&page=1&tbnh=154&tbnw=133&start=0&ndsp=27&ved=1t:
   429,r:2,s:0,i:118>.
"Ernest Rutherford." ANS Nuclear Cafe. N.p., n.d. Web. 25 Nov. 2012. <http://www.google.de/
   imgres?q=rutherford&num=10&um=1&hl=en&tbo=d&biw=1280&bih=610&tbm=isch&tbnid=j7iyBBxZjwCv5M:&imgrefurl
   =http://ansnuclearcafe.org/2011/05/31/lord-rutherford-and-the-atomic-pudding/rutherford-portrait2-4/
   &docid=n0-E1jKvkn66SM&imgurl=http://www.ansnuclearcafe.org/wp-content/uploads/2011/05/
   rutherford-portrait24.jpg&w=340&h=312&ei=mfOxUJSAOojZtAaQi4D4Cg&zoom=1&iact=hc&vpx=207&vpy=178&dur=50
   35&hovh=215&hovw=234&tx=165&ty=113&sig=101497173063126109233&sqi=2&page=1&tbnh=140&tbnw=147&start=0&n
   dsp=27&ved=1t:429,r:2,s:0,i:154>.
"Henry Moseley." Dipity. N.p., n.d. Web. 25 Nov. 2012. <http://www.google.de/
   imgres?q=moseley+atom&um=1&hl=en&tbo=d&biw=1280&bih=610&tbm=isch&tbnid=EimlJfNDtjTzeM:&imgrefurl=http
   ://www.dipity.com/Avalon/History-Of-The-Periodic-Table/
   &docid=Pr2GhR8Ohssg_M&imgurl=http://cdn.dipity.com/uploads/events/
   a9256068ca8b49a1ac1abbc8a70590cd_1M.png&w=255&h=393&ei=DvSxUKXsN4Tfsga0ioDAAQ&zoom=1&iact=hc&vpx=629&
   vpy=109&dur=258&hovh=279&hovw=181&tx=78&ty=142&sig=101497173063126109233&page=1&tbnh=139&tbnw=106&sta
   rt=0&ndsp=26&ved=1t:429,r:4,s:0,i:94>.
"History of the Periodic Table." RSC. N.p., n.d. Web. 25 Nov. 2012. <http://www.rsc.org/Education/
   Teachers/Resources/periodictable/pre16/order/atomicnumber.htm>.
"John Dalton." Dalton Wikispace. N.p., n.d. Web. 26 Nov. 2012. <http://www.google.de/
   imgres?q=dalton&um=1&hl=en&tbo=d&biw=1280&bih=610&tbm=isch&tbnid=EMUJZGzHxbax0M:&imgrefurl=http://the
   -history-of-the-atom.wikispaces.com/
   John%2BDalton&docid=rnY05mEJo99ZRM&imgurl=http://the-history-of-the-atom.wikispaces.com/file/view/
   JOHN_DALTON_REICH-CHEMMISTRY.jpg/183313997/299x299/
   JOHN_DALTON_REICH-CHEMMISTRY.jpg&w=300&h=300&ei=W5OzUP_XIsXRsgbOmICoDQ&zoom=1&iact=hc&vpx=4&vpy=174&d
   ur=500&hovh=225&hovw=225&tx=111&ty=110&sig=113953390841894950889&page=1&tbnh=142&tbnw=147&start=0&nds
   p=27&ved=1t:429,r:0,s:0,i:148>.
"Newlands." Wikipedia Pictures. N.p., n.d. Web. 26 Nov. 2012. <http://www.google.de/
   imgres?q=newlans&um=1&hl=en&tbo=d&biw=1280&bih=610&tbm=isch&tbnid=IWj9PjRZyiYjKM:&imgrefurl=http://en
   .wikipedia.org/wiki/
   John_Alexander_Reina_Newlands&docid=u5o_g0tfG2XVIM&imgurl=http://upload.wikimedia.org/wikipedia/
   commons/thumb/9/90/John_Alexander_Reina_Newlands.jpg/
   220px-John_Alexander_Reina_Newlands.jpg&w=220&h=303&ei=lJOzUN68JYbvsgbX4oDIBQ&zoom=1&iact=rc&dur=544&
   sig=113953390841894950889&page=1&tbnh=142&tbnw=103&start=0&ndsp=29&ved=1t:429,r:0,s:0,i:82&tx=98&ty=7
   1>.
"Periodic Table of Elements." PT Table. N.p., n.d. Web. 25 Nov. 2012. <http://www.ptable.com/
   Images/periodic%20table.png>.
"Robert Millikan." Quote Collection. N.p., n.d. Web. 25 Nov. 2012. <http://www.google.de/
   imgres?q=millikan&um=1&hl=en&sa=N&tbo=d&biw=1280&bih=610&tbm=isch&tbnid=zPdwmyV_mNYAxM:&imgrefurl=htt
   p://www.quotecollection.com/author/robert-millikan/
   &docid=6KCsut5Fhace-M&imgurl=http://www.quotecollection.com/author-images/
   robert-millikan-3.JPG&w=1000&h=1464&ei=GfOxUIy3I4bYtAbIiICQDA&zoom=1&iact=hc&vpx=244&vpy=154&dur=721&
   hovh=272&hovw=185&tx=120&ty=171&sig=101497173063126109233&page=1&tbnh=149&tbnw=111&start=0&ndsp=28&ve
   d=1t:429,r:2,s:0,i:118>.
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HISTORY OF THE ATOM

  • 1. The History of the Atom A Timeline by: Helena Brand, Nicole Reich, Matthias Roth and Max Klug
  • 2. Democritus 400BC The theory of Democritus was that everything is composed of atoms, which are physically but not geometrically indivisible. All atoms would then be indestructible with empty space between them. The atoms differ in shape and size. Democritus said, "The more any indivisible exceeds, the heavier it is." Aristotle 332BC The theory of Democritus was that everything is composed of atoms, which are physically but not geometrically indivisible. All atoms would then be indestructible with empty space between them. The atoms differ in shape and size. Democritus said, "The more any indivisible exceeds, the heavier it is." Dalton 1802 As an english chemist, meteorologist and physicist, Dalton researched about the Atomic Theory. After describing experiments to ascertain the pressure of steam at various points between 0 and 100 °C (32 and 212 °F), Dalton concluded from observations on the vapour pressure of six different liquids, that the variation of vapour pressure for all liquids is equivalent, for the same variation of temperature, reckoning from vapour of any given pressure.
  • 3. Dobereiner 1817 Johann Wolfgang Dobereiner was a German chemist who is best known for work that foreshadowed the periodic law for the chemical elements. He is known for the Dobereiner Triads which followed a similar pattern. Berzelius 1828 As a Swedish Chemist he worked out the modern technique chemical formula notation.He also analyzed 2000 compounds to provide the experimental basis for the atomic theory.Berzelius also introduced the symbolism with which chemical formulas are still written Newlands 1864 Newlands was born in London and was the son of a Scottish Presbyterian minister.He was born in 1837 and he was a English Chemist.He was one of the first to propound the conception of periodicity among the chemical elements.
  • 4. Mendeleev 1869 He arranged 63 known elements to form the periodic table. The elements were arranged by their atomic He even mass. predicted several elements, that were not discovered at that time
  • 5. Periodic Table of Elements
  • 6. J.J. Thomson He was the first to discover the electron. On the 30th of April 1897 he declared that there is In 1998 he suggested that there is a „proton“. a particle lighter than the lightest atom, However he could not prove this at that time. hydrogen. This particle is called the electron.
  • 7. Millikan 1910 Millikan researched the charge of an electron. Once repeated this experiment several times, he declared that results could be explained as integer multiples of a common value (1.592*10^-19 coulomb) the charge of a single electron. This number is slightly lower than the modern value of 1.602 176 53(14) x 10−19 coulomb due to Millikan's use of inaccurate value of the viscosity of air. Rutherford 1911 Ruthford designed a new model of the atom called the Rutherford Model. It disagreed with the “Plum Pudding Model” from J.J. Thompson. It showed a new way of looking at an atom. He discovered that there is an area in the atom, which has far more energy in a small volume than the rest. This is now called the “nucleus” of an atom. Moseley 1913 Looking at X-Rays passing through elements, Moseley corrected Mendeleev´s version of the periodic table. He then ordered the elements by their atomic number.
  • 8. Other Interesting Events at that Time Scientist Proust 1913-1927 1909 Worldwar Plastic was invented I begins 1927 BBC is founded in 1914 Bothe and Chadwick 1930
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