Chemistry Crossword Puzzle

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Across
  1. 2. the 1st element on the periodic table
  2. 5. a substance that cannot be broken down into other substances
  3. 6. the 6th element on the periodic table
Down
  1. 1. a group of atoms that are held together
  2. 3. the 8th element on the periodic table
  3. 4. the molecule with the chemical formula H2O
  4. 7. a tiny particle of an element