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Start with the full category, then apply the exact boundary: Atomic numbers 1–10, inclusive. Names or symbols accepted. You only need one qualifying answer. A longer name is not automatically rarer.
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FluorineFluorine (F) has atomic number 9 on the IUPAC periodic table.
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BerylliumBeryllium (Be) has atomic number 4 on the IUPAC periodic table.Aliases: Be
88FluorineFluorine (F) has atomic number 9 on the IUPAC periodic table.Aliases: F
74BoronBoron (B) has atomic number 5 on the IUPAC periodic table.Aliases: B
72LithiumLithium (Li) has atomic number 3 on the IUPAC periodic table.Aliases: Li
48NeonNeon (Ne) has atomic number 10 on the IUPAC periodic table.Aliases: Ne
47NitrogenNitrogen (N) has atomic number 7 on the IUPAC periodic table.Aliases: N
38HeliumHelium (He) has atomic number 2 on the IUPAC periodic table.Aliases: He
26CarbonCarbon (C) has atomic number 6 on the IUPAC periodic table.Aliases: C
18HydrogenHydrogen (H) has atomic number 1 on the IUPAC periodic table.Aliases: H
15OxygenOxygen (O) has atomic number 8 on the IUPAC periodic table.Aliases: O
12Why these answers qualify
Each entry belongs to the bounded set defined by the prompt. The named source supports the underlying facts; our editorial scoring is a separate layer.
Source: IUPAC · Periodic table
Reference version: 2026-09-13. See our answer policy for how we handle aliases and omissions.