Chapter 7 Electron Configuration and the Periodic Table
嚜澧hapter 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
2
? Mendeleev
每 Grouped elements (66) according to
properties
每 Predicted properties for elements not yet
discovered
每 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
3
? 1913 - Henry Moseley explained the
discrepancy
每 Discovered correlation between number
of protons (atomic number) and frequency
of X rays generated
每 Today, elements are arranged in order of
increasing atomic number
Copyright McGraw-Hill 2009
4
Periodic Table by Dates of Discovery
Copyright McGraw-Hill 2009
5
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