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THE PERIODIC SPIRAL |
Also known as the Helix Chemica, the diagram below was drawn by E.C. Pozzi in 1937.
In the upper half of the diagram: All elements have low density (below 4.0), simple spectra, strong e.m.f., and generally a single valence.
Upper left: Elements are acid-forming and negative, i.e., attract additional electrons.
Upper center: Elements are inert, i.e., have a complete octet.
Upper right: Elements are base-forming or positive, i.e., give up their valence electrons.
In the lower half of the diagram: All elements have greater density (above 4.0), complex spectra, weak e.m.f., and generally many valencies; they are amphoteric and may gain or lose electrons.
The abundance of the elements is shown by the hexagons as indicated at the top of the table.
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