This first-year college chemistry course has great summaries of concepts covered in your high school course, as well as information you can use to clarify or extend your understanding. For Chapter 3, look for the links (in the Lecture Notes) under the heading “Atoms, Molecules and Ions.” (
http://wine1.sb.fsu.edu/chm1045/chm1045.htm
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A good site for supplementing your understanding of important concepts related to electron configurations, periodic trends, chemical bonding, and many other topics covered in your textbook. (
http://www.scidiv.bcc.ctc.edu/wv/101-online.html
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This site has a useful overview to start your investigation of the ionic and covalent character of bonds. (
http://www.avogadro.co.uk/structure/bondnature.htm
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To learn more about the book this website supports, please visit its Information Center.