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PERIOD9.TXT
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1993-07-14
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While the row or period numbers are obvious, we have a choice as to how we
label the columns or groups. The International Union of Pure and Applied Chemistry
has now decided that the columns should be labelled from one to eighteen, and this is
what we shall do, but you could alter the main display of the Interactive Periodic Table
to show the old IUPAC or the American CAS (Chemical Abstracts Service) designations if you wanted.