A Brieft History: The Periodic Table

Hennig Brand •  1649  –  Discovered  the  element  Phosphorus.  The  pictures  below  is  “red  phosphorus.”  

A.E. Beguyer de Chancourtois

•  1817  –  Listed  elements  by  increasing  atomic  mass  on  a  cylinder.  

Johann Dobereiner

•  1862  –  Proposed  the  Law  of  Triads,  where  three  elements  in  nature  with  the  mass  of  the  middle  element  being  the  average  of  the  other  two.    

John Newlands

•  1863  –  Classified  the  56  known  elements  into  a  table  with  11  groups  based  on  properLes  .  Law  of  Octaves:  any  element  will  behave  similarly  to  the  8th  element.  

Lothar Meyer

•  1864  –  Developed  a  shortened  version  of  the  table  only  showing  half  of  the  known  elements,  in  order  of  atomic  mass  and  differences  in  behavior  were  due  to  mass.  

Dmitri Ivanovich

Mendeleev •  1869  –  Rearranged  

elements  in  order  of  their  properLes.  He  showed  a  verLcal,  horizontal,  and  diagonal  relaLonship  between  the  63  known  elements.      

Lord Rayleigh

•  1895  –  Discovered  argon  and  found  it  didn’t  fit  in  the  current  groups.  In  1898  he  proposed  a  new  group  to  be  called  zero  group      

Ernest Rutherford

•  1911  –  Studied  nuclei  which  led  to  the  concept  of  nuclear  charge.      

Henry Mosely

•  1913  –  Published  results  of  x-­‐ray  wavelengths  of  elements  which  proved  the  elements  are  in  order  of  atomic  number.      

Glenn Seaborg

•  1940  –  Discovered  plutonium  and  all  elements  from  94-­‐102.  He  moved  the  Lanthanides  and  AcLnides  below  the  table.      

 

Current Periodic Table 2012

Different Types of Periodic Tables

Hydrogen is removed:

Pictures showing where they’re found:

3D Model:

Visual: Pictures of actual elements

Circular Model:

3D Desk Periodic Table

Interactive Periodic Tables

•  hZp://www.ptable.com/  

•  hZp://www.chemicalelements.com/  

•  hZp://www.webelements.com/  

•  hZp://www.periodicvideos.com/  

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