Possible Clues:

• Periodic table figs
• Chem. class data
• Element's ID's
• Periodic table info: Abbr.
• 92 and 53 for U and I
• 5 for B and 6 for C
• B's 5 and C's 6
• Proton counts: Abbr
• 1 for H and 2 for He, e.g
• Periodic law figs