3Henry Dorin, Dorothy Gabel, Peter Dommin. Chemistry: The study of Matter, Englewood Cliffs, NJ. Pren- tice Hall Inc. 1992.
4H Eugene Le May, Jr. Herber Beall, Karen M Rob- blee, Douglas C Brower. Chemistry: Connection to our changing World. Upper Saddle River, NJ: Prentice Hall Inc., 1996.
5Laurel Dingrando, Kathleen Tallman, Nicholas Hainen, Cheryl Wistrom. Chemistry: Matter and Change. Columbus, OH. McGraw-Hill companies Inc. 2005.