Related Clues:

• Chem. amts.
• Periodic table info: Abbr.
• 7 for N, 8 for O, etc.
• Element info: abbr.
• Element's ID's
• B and O figures: Abbr.
• Periodic table figs.
• Periodic table figs
• 1 for H and 2 for He, e.g
• Proton counts: Abbr
• B's 5 and C's 6
• 5 for B and 6 for C
• 92 and 53 for U and I
• Chem. class data