Periodic Spiral of Elements
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<a href="https://en.wikipedia.org/wiki/File:Elementspiral.svg" class="extiw" title="en:File:Elementspiral.svg">en:File:Elementspiral.svg</a>. Benfey's spiral table first appeared in an article by Glenn Seaborg, "Plutonium: The Ornery Element", <i>Chemistry</i>, June 1964, 37 (6), 12-17, on p. 14.