| Atomic structure and chemical bondings, 2 quizzes.
Champaknath, attavarchamps@rediffmail.com, © 12/2001 |
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| Chemical bondings, 10 questions.
Vincent Farrell, Ireland, Email: vincentfarrell@ireland.com, © 04/2001 |
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| Shell Structure, DNA Codons, Atomic Number, 3 quizzes.
Allen Talbot, allentalbott@hotmail.com © 6/2005 |
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| Miscellaneous, 5 questions.
Susana Juanto, sjuanto@yahoo.com.ar, © 04/2004 |