Development of the Periodic Table

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Presentation transcript:

Development of the Periodic Table By Mike Marshall and Collin Malone

Recent Developments Most elements only discovered in the 19th century Scientists were able to isolate different elements Number of elements more that doubled in 65 years 1800 – 31, 1865 – 63

Original two Dmitri Mendeleev and Lothar Meyer Russia and Germany respectively Forerunners for development Unaware of atomic number Ordered by atomic weight

Meyer Produced more extensive table originally 1870 Produced table very similar to Mendeleev Listed periodic valence charges based on atomic weight

Mendeleev Youngest of 17 children Studied in Germany for two years to further chemistry knowledge Taught chemistry for some time after graduation Produced work in 1869 Taught chemistry until 1890

Mendeleev Predicted elements Gallium (eka-aluminum) and Germanium (eka-silicon) Elements with similar characteristics in same families Left spaces for elements that were yet to be discovered Predicted properties and left blank to be filled in upon discovery

Mendeleev’s Table

Henry Moseley Born 1887 Studied under Rutherford Made contributions fifty years after Mendeleev’s development Fought in World War I Died in 1915 in Gallipoli

Moseley English physicist Developed atomic number Discovered that each element produced unique wavelength of X-ray spectral line Generally increased as atomic mass increased Arranged in order by assigning unique whole number based on frequency Called this whole number the number of protons and electrons in each element Cleared up discrepancies with Mendeleev’s table (Argon and Potassium)

Quiz ____________ and ___________ created similar periodic tables in 1869 and 1870. ____________ arranged the elements on the periodic table in order of atomic number. What type of electromagnetic radiation was used to find the atomic numbers of elements? Is the periodic table that we use based on atomic mass or atomic number? Name one of the two elements that Mendeleev predicted would exist based on his periodic table.

Answers Dmitri Mendeleev & Lothar Meyer Henry Moseley X-Rays Atomic Number Gallium (eka-aluminum) or Germanium (eka-silicon)

Bibliography "A Brief History of the Development of Periodic Table." Western Oregon University. Western Oregon University, 1997. Web. 8 Nov. 2009. <http://www.wou.edu/las/physci/ch412/perhist.htm> Brown, Theodore L., et al. Chemistry: The Central Science. 9th ed. 1977. Upper Saddle River, NJ: Prentice Hall, 2003. Print. "Dmitri Mendeleev." History of the Periodic Table. N.p., n.d. Web. 8 Nov. 2009. <http://www.rsc.org/education/teachers/learnnet/periodictable/pre16/develop/index.htm> Leach, Mark R. "Periodic Table: Formulations." The Chemogenisis Web Book. N.p., 2009. Web. 8 Nov. 2009. <http://www.meta-synthesis.com/webbook/35_pt/pt.html> "Who was Henry Moseley." Kiwi Web: Chemistry and New Zealand. N.p., 2008. Web. 8 Nov. 2009. <http://www.chemistry.co.nz/henry_moseley.htm>