CK-12 Foundation
Ck 12: History of the Periodic Table
[Free Registration/Login may be required to access all resource tools.] Students explore the history of the periodic table, and explain how the periodic table was originally organized, compared to the arrangement of the modern periodic...
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Chemical Bonds: Electronegativity
A slideshow with several slides dedicated to electronegativity, the trend which is illustrated in the slide at this link. Others slides explain how the electronegativity can be used to determine bond character.