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	Unit 6b Periodic Table
The Periodic Table of Videos	Periodic Trends of Electron Affinity	Group 15 The Pnictogen (Nitrogen Family)
History of the Periodic Table	Periodic Trends Electronegativity	Group 16 The Chalcogens (Oxygen Family)
Really Detailed history by Dr. John Emsley	Ionic radius vs. Atomic radius	Allotropes
Structure of the Periodic Table	Metals, Nonmetals and Metalloids	Group 17 The Halogens
Periodic Trends Atomic Radii	Group 1 The Alkali Metals	Group 18 The Noble Gases
Periodic Trend Ionization Energy	Group 2 The Alkaline Earth Metals	Transition Elements

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