Ionic and Covalent Bonding
Links
Electronegativity
http://users.rcn.com/jkimball.ma.ultranet/BiologyPages/E/Electronegativity.html
Three dimensional periodic table of electronegativity.
Simon Fraser University Digital Text
http://www.chem1.com/chemed/digtexts.html
Introduction to chemistry including bonding. A course in digital text, many of which are available as PDF files.
Chemteam
http://dbhs.wvusd.k12.ca.us/webdocs/ChemTeamIndex.html
Tutorials for high school chemistry, including a short tutorial on bonding concepts.
Electronegativity: Pure Covalent, Polar Covalent and Ionic Bonding
http://neon.chem.uidaho.edu/~honors/electneg.html
A concise discussion of electronegativity as it relates to bonding.