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3. B and O figures: Abbr.

Alternative clues for the word atnos

• B's 5 and C's 6
• 7 for N, 8 for O, etc.
• They go from 57 to 71 in the lanthanide series: Abbr
• Proton counts: Abbr
• 92 for U and 53 for I: Abbr
• Element info: abbr
• Chem. class figures
• Periodic law figs.
• 5 for B and 6 for C
• 1 for H and 2 for He, e.g