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Science

Name an element with atomic number 11 to 20.

Both endpoints count. Names or symbols accepted.

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Start with the full category, then apply the exact boundary: Both endpoints count. Names or symbols accepted. You only need one qualifying answer. A longer name is not automatically rarer.

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ArgonArgon (Ar) has atomic number 18 on the IUPAC periodic table.
78

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Shortest accepted input at 65+ points

P

Phosphorus · 68 points · 1 characters

Phosphorus (P) has atomic number 15 on the IUPAC periodic table.

Highest fixed score

Argon

78 points · Shortest accepted spelling: Ar

These are editorial points, separate from real player choice counts.

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10 accepted answers

ArgonArgon (Ar) has atomic number 18 on the IUPAC periodic table.Aliases: ArShortest accepted input: Ar · 2 characters
78 points
PhosphorusPhosphorus (P) has atomic number 15 on the IUPAC periodic table.Aliases: PShortest accepted input: P · 1 characters
68 points
SulfurSulfur (S) has atomic number 16 on the IUPAC periodic table.Aliases: S · SulphurShortest accepted input: S · 1 characters
60 points
MagnesiumMagnesium (Mg) has atomic number 12 on the IUPAC periodic table.Aliases: MgShortest accepted input: Mg · 2 characters
54 points
PotassiumPotassium (K) has atomic number 19 on the IUPAC periodic table.Aliases: KShortest accepted input: K · 1 characters
52 points
ChlorineChlorine (Cl) has atomic number 17 on the IUPAC periodic table.Aliases: ClShortest accepted input: Cl · 2 characters
50 points
SiliconSilicon (Si) has atomic number 14 on the IUPAC periodic table.Aliases: SiShortest accepted input: Si · 2 characters
49 points
SodiumSodium (Na) has atomic number 11 on the IUPAC periodic table.Aliases: NaShortest accepted input: Na · 2 characters
42 points
CalciumCalcium (Ca) has atomic number 20 on the IUPAC periodic table.Aliases: CaShortest accepted input: Ca · 2 characters
39 points
AluminiumAluminium (Al) has atomic number 13 on the IUPAC periodic table.Aliases: Al · AluminumShortest accepted input: Al · 2 characters
35 points
Rule examples & common mix-ups — may reveal answers
  • Both the element’s group and the atomic-number limit must fit. A chemical symbol is an accepted spelling, not a way to bypass either restriction.

These notes explain the question boundary; they are not a ranking of player mistakes.

Why 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.

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