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Development of the Periodic Table

Development of the Periodic Table. What was the motivation for creating the Table? What is the basis for the design of the Table? Who developed it? How did they do it?. John Dalton atomic theory 1803-1805. PROPERTIES. MASS. Johann Dobereiner c. 1817 “ Triads ”. group of 3 elements

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Development of the Periodic Table

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  1. Development of the Periodic Table • What was the motivation for creating the Table? • What is the basis for the design of the Table? • Who developed it? How did they do it?

  2. John Daltonatomic theory 1803-1805 PROPERTIES MASS

  3. Johann Dobereinerc. 1817 “Triads” • group of 3 elements • middle = avg. of other 2

  4. John Newlands 1863-’65 “Law of Octaves” • all elements in order of mass • properties repeat every 8th element

  5. Dmitri Mendeleev1834-1907

  6. Dmitri Mendeleev1869 Periodic Table • all elements in order of mass • properties repeat periodically – no set row length

  7. Henry Moseley 1913 Moseley’s Law • “the properties of elements are a periodicfunction of atomic number”

  8. Henry Gwnn Jeffries Moseley1887-1915

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