Make a list of the names, symbols and atomic numbers of the chemical elements. Assign the values 1-16 to the letters A-Z. For each chemical element, calculate the sum of the 1 or 2 letter values forming its symbol. (You can ignore the chemical elements with 3-letter symbols.) Now see how quickly you can answer these questions.
"Some Elementary Questions,"
Word Ways: Vol. 49
, Article 24.
Available at: http://digitalcommons.butler.edu/wordways/vol49/iss2/24