This page lists every known solution for the clue “Element 18” in Crossword Challenge. Because this clue can appear in different puzzles (levels) with different required answers, we first list all the answers, then show which one appears in each puzzle below.
Element 18 Crossword Challenge Answers (All Variants)
Argon
If more than one answer is listed, open your puzzle page below to confirm the one used there.
All Known Answers for Element 18 Clue
Puzzle 307 — - Puzzle 400 —
Where This Clue Appears
Last Checked: September 12, 2025