Trends in Ionization Energy of Transition-Metal Elements

Paul S. Matsumoto
Galileo Academy of Science and Technology, San Francisco, CA 94109
J. Chem. Educ., 2005, 82 (11), p 1660
DOI: 10.1021/ed082p1660
Publication Date (Web): November 1, 2005
History, Education, and Documentation

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.

Keywords (Audience):

High School / Introductory Chemistry

Keywords (Domain):

Inorganic Chemistry

Keywords (Pedagogy):

Textbooks / Reference Books

Keywords (Subject):

Atomic Properties / Structure
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  • Received: August 03, 2009

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