Chapter 7 Electron Configuration and the Periodic Table
Chapter 7
Electron Configuration and the Periodic Table
Copyright McGraw-Hill 2009
1
7.1 Development of the
Periodic Table
? 1864 - John Newlands - Law of Octaves- every 8th element had similar properties when arranged by atomic masses (not true past Ca)
? 1869 - Dmitri Mendeleev & Lothar Meyer - independently proposed idea of periodicity (recurrence of properties)
Copyright McGraw-Hill 2009
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? Mendeleev
? Grouped elements (66) according to properties
? Predicted properties for elements not yet discovered
? Though a good model, Mendeleev could not explain inconsistencies, for instance, all elements were not in order according to atomic mass
Copyright McGraw-Hill 2009
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? 1913 - Henry Moseley explained the discrepancy
? Discovered correlation between number
of protons (atomic number) and frequency of X rays generated
? Today, elements are arranged in order of increasing atomic number
Copyright McGraw-Hill 2009
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Periodic Table by Dates of Discovery
Copyright McGraw-Hill 2009
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