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A Brief History of the Periodic Table

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Title: A Brief History of the Periodic Table Author: Halifax West Last modified by: Halifax West Created Date: 9/22/2014 12:17:28 PM Document presentation format – PowerPoint PPT presentation

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Title: A Brief History of the Periodic Table


1
A Brief History of the Periodic Table
  • This introduction will make use of our
    information on Atomic Theory in order to learn
    all about our periodic table

2
In the Beginning
  • In 1868, a Russian scientist named Dmitri
    Mendeleev began to look at the elements in an
    attempt to put them in order
  • At that time there were only 60 known elements
  • He decided to organize them into a table by
    increasing mass

3
  • He placed the elements next to each other by
    increasing atomic mass and started a new row when
    similar chemical behaviors were repeated
    periodically
  • This tendency to show a regular repeating pattern
    is known as periodicity

4
  • An important feature about this original table
    was that Mendeleev left blank spaces he felt
    that there were elements that had not been
    discovered yet
  • His initial organization, and further studies,
    lead to the discovery of more elements to fill in
    these blank spaces

5
  • In 1913, Henry Moseley made improvements to this
    first table by rearranging the elements based on
    atomic number rather than mass
  • This solved the irregularities in periodicity
    found in the original table
  • This version of the table is what we now know as
    the Periodic Table of Elements
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