Khan Academy on a Stick : Tabla periódica, grupos y enlaces

Khan Academy on a Stick

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Groups of the Periodic Table (ES)
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Properties of alkali, alkaline earth and transition metals. Halogens and noble gases.
Valence Electrons (ES)
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Looking at valence electrons to figure out reactivity
Periodic Table Trends: Ionization Energy (ES)
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What an ion is. Using the periodic table to understand how difficult it is to ionize an atom.
Other Periodic Table Trends (ES)
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Electronegativity, metallic nature and atomic radius.
Ionic, Covalent, and Metallic Bonds (ES)
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Introduction to ionic, covalent, polar covalent and metallic bonds.