by Mohamed Jemal
Re: articles by J. N. Spencer (J. Chem. Educ.1974,51, 577) and
by J. J. MacDonald (J. Chem. Educ.1990,67, 380)
The author J. N. Spencer replies
The Quantum Mechanical Explanation of the Periodic System by Kenneth Emerson
Re: article by E. Scerri The author replies
The "Chemistry Teacher Connection" (CTC) is especially for high school chemistry teachers. For only $40/year, it offers an online-only subscription to CLIC along with membership in the Division of Chemical Education, normally $65/year. CTC subscribers receive access to all articles and supplements from 1996 through the current issue.
Through special arrangement with the ACS, JCE High School CLIC is now able to provide subscribers with online access to Chemical & Engineering News articles that have been selected specifically for secondary science instructors and their students.
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