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Linus Pauling also offers his visionary insights and remarkable intuition into the success of the Herzfeld criterion in rationalizing the occurrence of metallic character in the periodic table of the chemical elements. Pauling also establishes the direct link with his concept of the metallic orbital. Photograph courtesy of California Institute of Technology [11] (Edwards PP, Sienko MJ. 1983 Private communication, Linus Pauling).
