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  Home > JCE Print > Journal of Chemical Education > Issues > 2005  > November  >
In the Classroom
Trends in Ionization Energy of Transition-Metal Elements
Paul S. Matsumoto
Galileo Academy of Science and Technology, San Francisco, CA 94109
Cover
November 2005
Vol. 82 No. 11
p. 1660
Abstract
As the number of protons increase within a period (or row) of the periodic table, the first ionization energies of the transition-metal elements are relatively steady, while that for the main-group elements increases. The effective nuclear charge mirrors and may explain the periodic trends in the first ionization energies of the transition-metal and main-group elements. The differing periodic trends in the effective nuclear charge are due to a greater increase in shielding in the transition-metal elements than in the main-group elements. The difference in shielding is due to the entry of electrons into an inner-shell orbital for the transition-metal elements, while electrons enter an outer-shell orbital for the main-group elements.
More Information
*  Citation
 Matsumoto, Paul S. J. Chem. Educ. 2005 82 1660.
*  Keywords
 Atomic Properties / Structure; High School / Introductory Chemistry; Inorganic Chemistry; Periodicity / Periodic Table; Textbooks / Reference Books; Transition Elements
*  History
 Created:
Last Updated:		 9/22/2005
9/29/2005
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