Capellen, Jennings Rare Earth Information Center, Iowa State University, Ames, Iowa.
Gschneidner, Karl A., Jr. Ames Laboratory, Iowa State University, Ames, Iowa.
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A chemical element, Sc, atomic number 21, atomic weight 44.956. The only naturally occurring isotope is 45Sc. The electronic configuration of the ground-state, gaseous atom consists of the argon rare-gas core plus three more electrons in the 3d14s2 levels. It has an unfilled inner shell (only one 3d electron) and is the first transition metal. It is one of the elements of the rare-earth group. See also: Periodic table; Rare-earth elements; Transition elements
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