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Early Periodic Table

Experience the journey of the periodic table evolution, from its humble roots in the 1700s to the modern, organized classification. Delve into the concepts of triads, musical octaves, and the groundbreaking work of scientists like Mendeleev and Moseley. Understand the significance of grouping elements based on properties and the arrangement by atomic number. Discover the significance of families, periods, metals, and nonmetals as you explore the dynamic nature of the periodic table.

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Early Periodic Table

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  1. Early Periodic Table • 1700’s about 30 elements listed. • Mostly metals used for constructive purposes, with a few non-metals.

  2. Early Periodic Table • J. W. Dobereiner (Early 1800’s) formed groups of 3 called “triads”. • Properties of the “middle” element are roughly the average of the other two [http://www.bbc.co.uk/schools/gcsebitesize/img/gcsechem_10.gif]

  3. Early Periodic Table • J. A. R. Newlands (1865) organized all the elements by atomic mass. • Properties repeated every 8 atoms. (musical octaves!) [http://www.bbc.co.uk/schools/gcsebitesize/img/gcsechem_10.gif]

  4. Early Periodic Table • Mendeleev (1869) publishes 1st “Periodic Table” • The table is arranged so that elements in columns have similar properties. [http://jchemed.chem.wisc.edu/Journal/Issues/2003/Aug/Images/JCE2003p847fig3.gif]

  5. [http://web.fccj.org/~ethall/2045/ch5/pt1871.gif]

  6. [http://www.dlt.ncssm.edu/TIGER/diagrams/periodic/MendeleevPrediction.gif][http://www.dlt.ncssm.edu/TIGER/diagrams/periodic/MendeleevPrediction.gif] The Mendeleev Song

  7. Early Periodic Table • Moseley (early 1900’s) develops the Periodic Law that arranges elements by atomic number.

  8. Early Periodic Table • Periodic Law – When elements are arranged in increasing atomic number, their physical and chemical properties show a periodic pattern. Click Here for The Dynamic Periodic Table

  9. The Periodic Table Today • Groups – Each vertical column of the periodic table, also known as families. [http://www.chem4kids.com/files/art/elem_pertable3.gif]

  10. The Periodic Table Today • Periods – This is each horizontal row of the periodic table. [http://www.chem4kids.com/files/art/elem_pertable3.gif]

  11. The Periodic Table Today • Metals – left of “zig-zag” • Nonmetals – right of “zig-zag”

  12. [http://www.chem.gla.ac.uk/teaching/GenChemWeb/assets/PeriodicTable/PTblMk2/PTblGroups.gif][http://www.chem.gla.ac.uk/teaching/GenChemWeb/assets/PeriodicTable/PTblMk2/PTblGroups.gif]

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