Keep the challenge. Reveal only as much as you need.
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Hint 1Meaning
any of the more than 100 known substances (of which 92 occur naturally) that cannot be separated into simpler substances and that singly or in combination constitute all matter
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Hint 2Best answers
Possible answers to the crossword clue CHEMICAL ELEMENT include HASSIUM (7 letters), FERMIUM (7 letters), KRYPTON (7 letters). Compare these suggestions with the number of squares and any crossing letters in your puzzle.