The two 6x6 squares below contain 72 distinct entries from the periodic table of the elements, chosen from among the 110 which have been assigned official names by the IUPAC (International Union of Pure and Applied Chemistry). Each small square displays the standard abbreviation and atomic number of its element.
"A Magical Pair of 6x6 Chemical Squares,"
Word Ways: Vol. 37
, Article 4.
Available at: http://digitalcommons.butler.edu/wordways/vol37/iss1/4