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3. B's 5 and C's 6

Alternative clues for the word atnos

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