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Periodic table review

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Amanda McClelland

The document reviews key concepts from the periodic table including its history as originally organized by elements in periods and groups, trends in atomic weight, valence electrons and electron shells, and how elements are classified as light or heavy based on their valence electron numbers and electron shell configurations.

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Periodic Table Review
Chemistry 101
Miss McClelland

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History

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The Original

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Periods
Groups

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Trends
Atomic Weight
Valence Electrons
Electron Shells

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Light
Heavy

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Valence Electrons Numbers
1 6 7 8542 3

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Electron Shell Numbers
1
6
7
5
4
2
3

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Periodic table review

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6. + Light Heavy

7. + Valence Electrons Numbers 1 6 7 8542 3

8. + Electron Shell Numbers 1 6 7 5 4 2 3

Editor's Notes

Dmitri Mendeleev and Lothar Meyer both developed and published an arrangement of Elements in 1869. The Elements were arranged by chemical and physical properties, and atomic weight. Henry Moseley added Atomic numbers to the Elements in 1913.