<img src="https://d5nxst8fruw4z.cloudfront.net/atrk.gif?account=iA1Pi1a8Dy00ym" style="display:none" height="1" width="1" alt="" />
Skip Navigation

Early History of the Periodic Table

Two early attempts to organize the known elements.

Atoms Practice
Estimated5 minsto complete
Practice Early History of the Periodic Table
This indicates how strong in your memory this concept is
Estimated5 minsto complete
Practice Now
Turn In
Finding Patterns in Elemental Behavior

Finding Patterns in Elemental Behavior

Credit: Liza
Source: http://www.flickr.com/photos/lizadaly/2944407755/
License: CC BY-NC 3.0

Why It Matters

  • Early attempts to organize the elements either listed the known elements by atomic mass or focused on “triads” that had similar chemical properties, such as lithium, sodium, and potassium.
  • Dmitri Mendeleev, often credited with the invention of the modern periodic table, combined both of these approaches, but left gaps to ensure that elements with similar properties were lined up together.
  • Credit: Shehal Joseph
    Source: http://www.flickr.com/photos/shehal/2453867520/
    License: CC BY-NC 3.0

    An early version of Mendeleev's periodic table. Notice that it looks different from the more modern periodic table [Figure2]

  • The gaps in Mendeleev’s table corresponded to undiscovered elements, and many of their properties could be predicted based on their position in the table.
  • Learn more about Mendeleev and his periodic table by watching the following video:http://www.youtube.com/watch?feature=player_embedded&v=fPnwBITSmgU

Can You Apply It?

With the links below, learn more about the periodic table. Then answer the following questions.

  1. Mendeleev placed tellurium before iodine on his periodic table, even though tellurium has a higher atomic mass. Why?
  2. The modern periodic table is not arranged by atomic mass. What atomic property is used instead to reliably group together elements with similar chemical characteristics?
  3. Carbon can be burned in oxygen to produce CO2 gas. Sand and quartz are two common forms of SiO2, which makes up over half of the Earth’s crust. Name two other elements (X) that are likely to form a compound with the formula XO2.
  4. At room temperature, chlorine is a yellowish gas, bromine is a brown liquid, and iodine is a shiny blue-black solid. Why are these elements considered similar enough to group together on the periodic table?

Notes/Highlights Having trouble? Report an issue.

Color Highlighted Text Notes
Please to create your own Highlights / Notes
Show More

Image Attributions

  1. [1]^ Credit: Liza; Source: http://www.flickr.com/photos/lizadaly/2944407755/; License: CC BY-NC 3.0
  2. [2]^ Credit: Shehal Joseph; Source: http://www.flickr.com/photos/shehal/2453867520/; License: CC BY-NC 3.0

Explore More

Sign in to explore more, including practice questions and solutions for Early History of the Periodic Table.
Please wait...
Please wait...